diff --git a/src/FileContentsCache.cc b/src/FileContentsCache.cc
index 15c176a1..91fb7679 100644
--- a/src/FileContentsCache.cc
+++ b/src/FileContentsCache.cc
@@ -79,20 +79,13 @@ shared_ptr<const string> ThreadSafeFileCache::get(
     const string& name, std::function<shared_ptr<const string>(const std::string&)> generate) {
   try {
     shared_lock g(this->lock);
-    auto ret = this->name_to_file.at(name);
-    if (!ret) {
-      throw cannot_open_file(name);
-    }
-    return ret;
+    return this->name_to_file.at(name);
   } catch (const out_of_range&) {
     unique_lock g(this->lock);
     auto it = this->name_to_file.find(name);
     if (it == this->name_to_file.end()) {
       it = this->name_to_file.emplace(name, generate(name)).first;
     }
-    if (!it->second) {
-      throw cannot_open_file(name);
-    }
     return it->second;
   }
 }
diff --git a/src/Lobby.cc b/src/Lobby.cc
index 4b20f6d0..d63d0e21 100644
--- a/src/Lobby.cc
+++ b/src/Lobby.cc
@@ -291,10 +291,30 @@ shared_ptr<Map> Lobby::load_maps(
     uint8_t difficulty,
     uint8_t event,
     uint32_t lobby_id,
+    shared_ptr<const SetDataTableBase> sdt,
     function<shared_ptr<const string>(Version, const string&)> get_file_data,
     shared_ptr<const Map::RareEnemyRates> rare_rates,
     shared_ptr<PSOLFGEncryption> random_crypt,
-    const parray<le_uint32_t, 0x20>& variations) {
+    const parray<le_uint32_t, 0x20>& variations,
+    const PrefixedLogger* log) {
+  auto enemy_filenames = sdt->map_filenames_for_variations(variations, episode, mode, true);
+  auto object_filenames = sdt->map_filenames_for_variations(variations, episode, mode, false);
+  return Lobby::load_maps(enemy_filenames, object_filenames, version, episode, mode, difficulty, event, lobby_id, get_file_data, rare_rates, random_crypt, log);
+}
+
+shared_ptr<Map> Lobby::load_maps(
+    const vector<string>& enemy_filenames,
+    const vector<string>& object_filenames,
+    Version version,
+    Episode episode,
+    GameMode mode,
+    uint8_t difficulty,
+    uint8_t event,
+    uint32_t lobby_id,
+    function<shared_ptr<const string>(Version, const string&)> get_file_data,
+    shared_ptr<const Map::RareEnemyRates> rare_rates,
+    shared_ptr<PSOLFGEncryption> random_crypt,
+    const PrefixedLogger* log) {
   auto map = make_shared<Map>(version, lobby_id, random_crypt);
 
   // Don't load free-roam maps in Challenge mode, since players can't go to
@@ -303,58 +323,42 @@ shared_ptr<Map> Lobby::load_maps(
     return map;
   }
 
-  for (size_t floor = 0; floor < 0x10; floor++) {
-    auto enemy_filenames = map_filenames_for_variation(
-        version,
-        episode,
-        mode,
-        floor,
-        variations[floor * 2],
-        variations[floor * 2 + 1],
-        true);
-    if (!enemy_filenames.empty()) {
-      bool any_map_loaded = false;
-      for (const string& filename : enemy_filenames) {
-        auto map_data = get_file_data(version, filename);
-        if (map_data) {
-          map->add_enemies_from_map_data(
-              episode,
-              difficulty,
-              event,
-              floor,
-              map_data->data(),
-              map_data->size(),
-              rare_rates);
-          any_map_loaded = true;
-          break;
+  for (size_t floor = 0; floor < 0x12; floor++) {
+    const auto& floor_enemy_filename = enemy_filenames.at(floor);
+    if (!floor_enemy_filename.empty()) {
+      auto map_data = get_file_data(version, floor_enemy_filename);
+      if (map_data) {
+        map->add_enemies_from_map_data(
+            episode,
+            difficulty,
+            event,
+            floor,
+            map_data->data(),
+            map_data->size(),
+            rare_rates);
+        if (log) {
+          log->info("Loaded enemies map %s for floor %02zX", floor_enemy_filename.c_str(), floor);
         }
+      } else if (log) {
+        log->info("Enemies map %s for floor %02zX cannot be used; skipping", floor_enemy_filename.c_str(), floor);
       }
-      if (!any_map_loaded) {
-        throw runtime_error(string_printf("no enemy maps loaded for floor %zu", floor));
-      }
+    } else if (log) {
+      log->info("No enemies to load for floor %02zX", floor);
     }
 
-    auto object_filenames = map_filenames_for_variation(
-        version,
-        episode,
-        mode,
-        floor,
-        variations[floor * 2],
-        variations[floor * 2 + 1],
-        false);
-    if (!object_filenames.empty()) {
-      bool any_map_loaded = false;
-      for (const string& filename : object_filenames) {
-        auto map_data = get_file_data(version, filename);
-        if (map_data) {
-          map->add_objects_from_map_data(floor, map_data->data(), map_data->size());
-          any_map_loaded = true;
-          break;
+    const auto& floor_object_filename = object_filenames.at(floor);
+    if (!floor_object_filename.empty()) {
+      auto map_data = get_file_data(version, floor_object_filename);
+      if (map_data) {
+        map->add_objects_from_map_data(floor, map_data->data(), map_data->size());
+        if (log) {
+          log->info("Loaded objects map %s for floor %02zX", floor_object_filename.c_str(), floor);
         }
+      } else if (log) {
+        log->info("Objects map %s for floor %02zX cannot be used; skipping", floor_object_filename.c_str(), floor);
       }
-      if (!any_map_loaded) {
-        throw runtime_error(string_printf("no object maps loaded for floor %zu", floor));
-      }
+    } else if (log) {
+      log->info("No objects to load for floor %02zX", floor);
     }
   }
 
@@ -392,10 +396,12 @@ void Lobby::load_maps() {
         this->difficulty,
         this->event,
         this->lobby_id,
+        s->set_data_table(this->base_version, this->episode, this->mode, this->difficulty),
         bind(&ServerState::load_map_file, s.get(), placeholders::_1, placeholders::_2),
         rare_rates,
         this->random_crypt,
-        this->variations);
+        this->variations,
+        &this->log);
 
   } else {
     this->map = make_shared<Map>(this->base_version, this->lobby_id, this->random_crypt);
diff --git a/src/Lobby.hh b/src/Lobby.hh
index 82d93b83..edb6d8ae 100644
--- a/src/Lobby.hh
+++ b/src/Lobby.hh
@@ -211,10 +211,25 @@ struct Lobby : public std::enable_shared_from_this<Lobby> {
       uint8_t difficulty,
       uint8_t event,
       uint32_t lobby_id,
+      std::shared_ptr<const SetDataTableBase> sdt,
       std::function<std::shared_ptr<const std::string>(Version, const std::string&)> get_file_data,
       std::shared_ptr<const Map::RareEnemyRates> rare_rates,
       std::shared_ptr<PSOLFGEncryption> random_crypt,
-      const parray<le_uint32_t, 0x20>& variations);
+      const parray<le_uint32_t, 0x20>& variations,
+      const PrefixedLogger* log = nullptr);
+  static std::shared_ptr<Map> load_maps(
+      const std::vector<std::string>& enemy_filenames,
+      const std::vector<std::string>& object_filenames,
+      Version version,
+      Episode episode,
+      GameMode mode,
+      uint8_t difficulty,
+      uint8_t event,
+      uint32_t lobby_id,
+      std::function<std::shared_ptr<const std::string>(Version, const std::string&)> get_file_data,
+      std::shared_ptr<const Map::RareEnemyRates> rare_rates,
+      std::shared_ptr<PSOLFGEncryption> random_crypt,
+      const PrefixedLogger* log = nullptr);
   void load_maps();
   void create_ep3_server();
 
diff --git a/src/Main.cc b/src/Main.cc
index 888bc3d7..af777835 100644
--- a/src/Main.cc
+++ b/src/Main.cc
@@ -1114,6 +1114,196 @@ Action a_disassemble_quest_map(
       string result = Map::disassemble_quest_data(data.data(), data.size());
       write_output_data(args, result.data(), result.size(), "txt");
     });
+Action a_disassemble_set_data_table(
+    "disassemble-set-data-table", "\
+  disassemble-set-data-table [INPUT-FILENAME]\n\
+    Show the contents of a SetDataTable.rel file. A version option is required.\n",
+    +[](Arguments& args) {
+      Version version = get_cli_version(args);
+      SetDataTable sdt(version, read_input_data(args));
+      string str = sdt.str();
+      write_output_data(args, str.data(), str.size(), "txt");
+    });
+Action a_check_set_data_table(
+    "check-set-data-tables", nullptr, +[](Arguments&) {
+      ServerState s;
+      s.load_objects_and_upstream_dependents("set_data_tables");
+      static_game_data_log.min_level = LogLevel::DISABLED;
+
+      auto get_file_data = [&](Version version, const string& filename) -> shared_ptr<const string> {
+        try {
+          return s.load_map_file(version, filename);
+        } catch (const cannot_open_file&) {
+          return nullptr;
+        }
+      };
+
+      auto check_filenames = [&](Version version, const string& sdt_filename, const vector<string>& ns_filenames) -> string {
+        for (size_t z = 0; z < ns_filenames.size(); z++) {
+          const auto& ns_filename = ns_filenames[z];
+          auto data = get_file_data(version, ns_filename);
+          if (data) {
+            if (sdt_filename != ns_filename) {
+              string ns_filenames_str = join(ns_filenames, ", ");
+              return string_printf("SDT => %s, NS => [%s]", sdt_filename.c_str(), ns_filenames_str.c_str());
+            }
+            return "OK";
+          }
+          if (!data && (sdt_filename == ns_filename)) {
+            string ns_filenames_str = join(ns_filenames, ", ");
+            return string_printf("SDT => %s (missing)", sdt_filename.c_str());
+          }
+        }
+        if (ns_filenames.empty() && sdt_filename.empty()) {
+          return "OK (no files)";
+        } else if (ns_filenames.empty()) {
+          auto data = get_file_data(version, sdt_filename);
+          if (data) {
+            return string_printf("NS blank, SDT => %s", sdt_filename.c_str());
+          } else {
+            return string_printf("NS blank, SDT => %s (missing)", sdt_filename.c_str());
+          }
+        } else if (sdt_filename.empty()) {
+          string ns_filenames_str = join(ns_filenames, ", ");
+          return string_printf("SDT blank, NS => [%s] (all missing)", ns_filenames_str.c_str());
+        } else {
+          string ns_filenames_str = join(ns_filenames, ", ");
+          return string_printf("SDT => %s (missing), NS => [%s] (all missing)", sdt_filename.c_str(), ns_filenames_str.c_str());
+        }
+      };
+
+      size_t num_checks = 0;
+      size_t num_errors = 0;
+      auto check_table = [&](Version version) {
+        vector<Episode> episodes({Episode::EP1});
+        if (!is_v1_or_v2(version) || (version == Version::GC_NTE)) {
+          episodes.emplace_back(Episode::EP2);
+          if (is_v4(version)) {
+            episodes.emplace_back(Episode::EP4);
+          }
+        }
+
+        vector<GameMode> modes({GameMode::NORMAL});
+        if (!is_v1(version)) {
+          modes.emplace_back(GameMode::BATTLE);
+          modes.emplace_back(GameMode::CHALLENGE);
+        }
+        if (is_v4(version)) {
+          modes.emplace_back(GameMode::SOLO);
+        }
+
+        uint8_t max_difficulty = is_v1(version) ? 2 : 3;
+
+        for (Episode episode : episodes) {
+          for (GameMode mode : modes) {
+            for (uint8_t difficulty = 0; difficulty <= max_difficulty; difficulty++) {
+              auto sdt = s.set_data_table(version, episode, mode, difficulty);
+              auto ns_var_maxes = variation_maxes_deprecated(version, episode, (mode == GameMode::SOLO));
+              size_t num_floors;
+              if (episode == Episode::EP4) {
+                num_floors = 0x0B;
+              } else if (episode == Episode::EP2) {
+                num_floors = 0x10;
+              } else {
+                num_floors = 0x0F;
+              }
+              for (size_t floor = 0; floor < num_floors; floor++) {
+                auto sdt_var_avail = sdt->num_available_variations_for_floor(episode, floor);
+                auto sdt_var_maxes = sdt->num_free_roam_variations_for_floor(episode, mode == GameMode::SOLO, floor);
+                size_t sdt_var1_max_avail = sdt_var_avail.first - 1;
+                size_t sdt_var2_max_avail = sdt_var_avail.second - 1;
+                size_t sdt_var1_max = sdt_var_maxes.first - 1;
+                size_t sdt_var2_max = sdt_var_maxes.second - 1;
+                size_t ns_var1_max = ns_var_maxes[floor * 2];
+                size_t ns_var2_max = ns_var_maxes[floor * 2 + 1];
+                num_checks += 4;
+                if (sdt_var1_max > sdt_var1_max_avail) {
+                  fprintf(stdout, "## %-8s %-10s %-10s %-10s %02zX VAR1:[SDT:%02zX SDTA:%02zX]\n",
+                      name_for_enum(version),
+                      name_for_episode(episode),
+                      name_for_mode(mode),
+                      name_for_difficulty(difficulty),
+                      floor,
+                      sdt_var1_max,
+                      sdt_var1_max_avail);
+                  num_errors++;
+                }
+                if (sdt_var2_max > sdt_var2_max_avail) {
+                  fprintf(stdout, "## %-8s %-10s %-10s %-10s %02zX VAR2:[SDT:%02zX SDTA:%02zX]\n",
+                      name_for_enum(version),
+                      name_for_episode(episode),
+                      name_for_mode(mode),
+                      name_for_difficulty(difficulty),
+                      floor,
+                      sdt_var2_max,
+                      sdt_var2_max_avail);
+                  num_errors++;
+                }
+                if (sdt_var1_max < ns_var1_max) {
+                  fprintf(stdout, "## %-8s %-10s %-10s %-10s %02zX VAR1:[SDT:%02zX NS:%02zX]\n",
+                      name_for_enum(version),
+                      name_for_episode(episode),
+                      name_for_mode(mode),
+                      name_for_difficulty(difficulty),
+                      floor,
+                      sdt_var1_max,
+                      ns_var1_max);
+                  num_errors++;
+                }
+                if (sdt_var2_max < ns_var2_max) {
+                  fprintf(stdout, "## %-8s %-10s %-10s %-10s %02zX VAR2:[SDT:%02zX NS:%02zX]\n",
+                      name_for_enum(version),
+                      name_for_episode(episode),
+                      name_for_mode(mode),
+                      name_for_difficulty(difficulty),
+                      floor,
+                      sdt_var2_max,
+                      ns_var2_max);
+                  num_errors++;
+                }
+                for (size_t var1 = 0; var1 <= ns_var1_max; var1++) {
+                  for (size_t var2 = 0; var2 <= ns_var2_max; var2++) {
+                    auto sdt_enemy_filename = sdt->map_filename_for_variation(floor, var1, var2, episode, mode, true);
+                    auto sdt_object_filename = sdt->map_filename_for_variation(floor, var1, var2, episode, mode, false);
+                    auto ns_enemy_filenames = map_filenames_for_variation_deprecated(floor, var1, var2, version, episode, mode, true);
+                    auto ns_object_filenames = map_filenames_for_variation_deprecated(floor, var1, var2, version, episode, mode, false);
+                    string enemies_error = check_filenames(version, sdt_enemy_filename, ns_enemy_filenames);
+                    string objects_error = check_filenames(version, sdt_object_filename, ns_object_filenames);
+                    num_checks += 2;
+                    num_errors += (enemies_error != "OK") + (objects_error != "OK");
+                    fprintf(stdout, "%s %-8s %-10s %-10s %-10s %02zX %02zX %02zX E:[%s] O:[%s] E:%-30s O:%-30s\n",
+                        ((enemies_error != "OK") || (objects_error != "OK")) ? "##" : "  ",
+                        name_for_enum(version),
+                        name_for_episode(episode),
+                        name_for_mode(mode),
+                        name_for_difficulty(difficulty),
+                        floor,
+                        var1,
+                        var2,
+                        enemies_error.c_str(),
+                        objects_error.c_str(),
+                        sdt_enemy_filename.c_str(),
+                        sdt_object_filename.c_str());
+                  }
+                }
+              }
+            }
+          }
+        }
+      };
+
+      check_table(Version::DC_NTE);
+      check_table(Version::DC_V1_11_2000_PROTOTYPE);
+      check_table(Version::DC_V1);
+      check_table(Version::DC_V2);
+      check_table(Version::PC_NTE);
+      check_table(Version::PC_V2);
+      check_table(Version::GC_NTE);
+      check_table(Version::GC_V3);
+      check_table(Version::XB_V3);
+      check_table(Version::BB_V4);
+      fprintf(stdout, "%zu/%zu errors\n", num_errors, num_checks);
+    });
 
 Action a_assemble_quest_script(
     "assemble-quest-script", "\
@@ -1883,7 +2073,7 @@ Action a_find_rare_enemy_seeds(
           map = Lobby::load_maps(version, episode, difficulty, 0, 0, rare_rates, random_crypt, vq);
 
         } else {
-          generate_variations(variations, random_crypt, version, episode, (mode == GameMode::SOLO));
+          generate_variations_deprecated(variations, random_crypt, version, episode, (mode == GameMode::SOLO));
           map = Lobby::load_maps(
               version,
               episode,
@@ -1891,6 +2081,7 @@ Action a_find_rare_enemy_seeds(
               difficulty,
               0,
               0,
+              s.set_data_table(version, episode, mode, difficulty),
               bind(&ServerState::load_map_file, &s, placeholders::_1, placeholders::_2),
               rare_rates,
               random_crypt,
diff --git a/src/Map.cc b/src/Map.cc
index 36449322..cde22a2e 100644
--- a/src/Map.cc
+++ b/src/Map.cc
@@ -1637,8 +1637,59 @@ string Map::disassemble_quest_data(const void* data, size_t size) {
   return join(ret, "\n") + "\n";
 }
 
-SetDataTable::SetDataTable(shared_ptr<const string> data, bool big_endian) {
-  if (big_endian) {
+SetDataTableBase::SetDataTableBase(Version version) : version(version) {}
+
+parray<le_uint32_t, 0x20> SetDataTableBase::generate_variations(
+    Episode episode, bool is_solo, std::shared_ptr<PSOLFGEncryption> random_crypt) const {
+  parray<le_uint32_t, 0x20> ret;
+  for (size_t floor = 0; floor < 0x10; floor++) {
+    auto num_vars = this->num_free_roam_variations_for_floor(episode, is_solo, floor);
+    ret[floor * 2] = (num_vars.first > 1) ? (random_crypt->next() % num_vars.first) : 0;
+    ret[floor * 2 + 1] = (num_vars.second > 1) ? (random_crypt->next() % num_vars.second) : 0;
+  }
+  return ret;
+}
+
+vector<string> SetDataTableBase::map_filenames_for_variations(
+    const parray<le_uint32_t, 0x20>& variations, Episode episode, GameMode mode, bool is_enemies) const {
+  vector<string> ret;
+  for (uint8_t floor = 0; floor < 0x10; floor++) {
+    ret.emplace_back(this->map_filename_for_variation(
+        floor, variations[floor * 2], variations[floor * 2 + 1], episode, mode, is_enemies));
+  }
+  for (uint8_t floor = 0x10; floor < 0x12; floor++) {
+    ret.emplace_back(this->map_filename_for_variation(floor, 0, 0, episode, mode, is_enemies));
+  }
+  return ret;
+}
+
+uint8_t SetDataTableBase::default_area_for_floor(Episode episode, uint8_t floor) const {
+  // For some inscrutable reason, Pioneer 2's area number in Episode 4 is
+  // discontiguous with all the rest. Why, Sega??
+  static const std::array<uint8_t, 0x12> areas_ep1 = {
+      0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11};
+  static const std::array<uint8_t, 0x12> areas_ep2_gc_nte = {
+      0x00, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0xFF, 0xFF};
+  static const std::array<uint8_t, 0x12> areas_ep2 = {
+      0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23};
+  static const std::array<uint8_t, 0x12> areas_ep4 = {
+      0x2D, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2E, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+  switch (episode) {
+    case Episode::EP1:
+      return areas_ep1.at(floor);
+    case Episode::EP2: {
+      const auto& areas = ((this->version == Version::GC_NTE) ? areas_ep2_gc_nte : areas_ep2);
+      return areas.at(floor);
+    }
+    case Episode::EP4:
+      return areas_ep4.at(floor);
+    default:
+      throw logic_error("incorrect episode");
+  }
+}
+
+SetDataTable::SetDataTable(Version version, const string& data) : SetDataTableBase(version) {
+  if (is_big_endian(this->version)) {
     this->load_table_t<true>(data);
   } else {
     this->load_table_t<false>(data);
@@ -1646,10 +1697,10 @@ SetDataTable::SetDataTable(shared_ptr<const string> data, bool big_endian) {
 }
 
 template <bool IsBigEndian>
-void SetDataTable::load_table_t(shared_ptr<const string> data) {
+void SetDataTable::load_table_t(const string& data) {
   using U32T = typename conditional<IsBigEndian, be_uint32_t, le_uint32_t>::type;
 
-  StringReader r(*data);
+  StringReader r(data);
 
   struct Footer {
     U32T table3_offset;
@@ -1688,17 +1739,99 @@ void SetDataTable::load_table_t(shared_ptr<const string> data) {
   }
 }
 
-void SetDataTable::print(FILE* stream) const {
+pair<uint32_t, uint32_t> SetDataTable::num_available_variations_for_floor(Episode episode, uint8_t floor) const {
+  uint8_t area = this->default_area_for_floor(episode, floor);
+  if (area == 0xFF) {
+    return make_pair(1, 1);
+  } else {
+    const auto& e = this->entries.at(area);
+    return make_pair(e.size(), e.at(0).size());
+  }
+}
+
+pair<uint32_t, uint32_t> SetDataTable::num_free_roam_variations_for_floor(Episode episode, bool is_solo, uint8_t floor) const {
+  uint8_t area = this->default_area_for_floor(episode, floor);
+  if (area == 0xFF) {
+    return make_pair(1, 1);
+  }
+  static const array<uint32_t, 0x2F * 2> counts_on = {
+      // Episode 1 (00-11)
+      // P2 -F1-, -F2-, -C1-, -C2-, -C3-, -M1-, -M2-, -R1-, -R2-, -R3-, DRGN, DRL-, -VO-, -DF-, LOBBY, VS1-, VS2-,
+      1, 1, 1, 5, 1, 5, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 10, 1, 1, 1, 1, 1,
+      // Episode 2 (12-23)
+      // P2 VRTA, VRTB, VRSA, VRSB, CCA-, -JN-, -JS-, MNTN, SEAS, SBU-, SBL-, -GG-, -OF-, -BR-, -GD-, SSN-, TWR-,
+      1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 3, 1, 3, 1, 3, 2, 2, 1, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      // Episode 4 (24-2E)
+      // CE -CW-, -CS-, -CN-, -CI-, DES1, DES2, DES3, SMIL, -P2-, TEST
+      1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 3, 1, 1, 3, 3, 1, 1, 1, 1, 1, 1, 1};
+  static const array<uint32_t, 0x2F * 2> counts_off = {
+      // Episode 1 (00-11)
+      // P2 -F1-, -F2-, -C1-, -C2-, -C3-, -M1-, -M2-, -R1-, -R2-, -R3-, DRGN, DRL-, -VO-, -DF-, LOBBY, VS1-, VS2-,
+      1, 1, 1, 3, 1, 3, 3, 1, 3, 1, 3, 1, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 10, 1, 1, 1, 1, 1,
+      // Episode 2 (12-23)
+      // P2 VRTA, VRTB, VRSA, VRSB, CCA-, -JN-, -JS-, MNTN, SEAS, SBU-, SBL-, -GG-, -OF-, -BR-, -GD-, SSN-, TWR-,
+      1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 3, 1, 3, 1, 3, 2, 2, 1, 3, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      // Episode 4 (24-2E)
+      // CE -CW-, -CS-, -CN-, -CI-, DES1, DES2, DES3, SMIL, -P2-, TEST
+      1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 3, 1, 1, 3, 3, 1, 1, 1, 1, 1, 1, 1};
+  const auto& data = is_solo ? counts_off : counts_on;
+  if ((floor * 2 + 1) < data.size()) {
+    auto available = this->num_available_variations_for_floor(episode, floor);
+    return make_pair(min<uint32_t>(available.first, data[area * 2]), min<uint32_t>(available.second, data[area * 2 + 1]));
+  }
+  throw runtime_error("invalid area");
+}
+
+string SetDataTable::map_filename_for_variation(
+    uint8_t floor, uint32_t var1, uint32_t var2, Episode episode, GameMode mode, bool is_enemies) const {
+  uint8_t area = this->default_area_for_floor(episode, floor);
+  if (area == 0xFF) {
+    return "";
+  }
+
+  if (area >= this->entries.size()) {
+    return "";
+  }
+
+  const auto& entry = this->entries.at(area).at(var1).at(var2);
+  string filename = is_enemies ? entry.enemy_list_basename : entry.object_list_basename;
+
+  filename += (is_enemies ? "e" : "o");
+
+  switch ((floor != 0) ? GameMode::NORMAL : mode) {
+    case GameMode::NORMAL:
+      filename += ".dat";
+      break;
+    case GameMode::SOLO:
+      filename += "_s.dat";
+      break;
+    case GameMode::CHALLENGE:
+      filename += "_c1.dat";
+      break;
+    case GameMode::BATTLE:
+      filename += "_d.dat";
+      break;
+    default:
+      throw logic_error("invalid game mode");
+  }
+
+  return filename;
+}
+
+string SetDataTable::str() const {
+  vector<string> lines;
+  lines.emplace_back(string_printf("FL/V1/V2 => ----------------------OBJECT -----------------------ENEMY -----------------------EVENT\n"));
   for (size_t a = 0; a < this->entries.size(); a++) {
     const auto& v1_v = this->entries[a];
     for (size_t v1 = 0; v1 < v1_v.size(); v1++) {
       const auto& v2_v = v1_v[v1];
       for (size_t v2 = 0; v2 < v2_v.size(); v2++) {
         const auto& e = v2_v[v2];
-        fprintf(stream, "[%02zX/%02zX/%02zX] %s %s %s\n", a, v1, v2, e.object_list_basename.c_str(), e.enemy_list_basename.c_str(), e.event_list_basename.c_str());
+        lines.emplace_back(string_printf("%02zX/%02zX/%02zX => %28s %28s %28s\n", a, v1, v2, e.object_list_basename.c_str(), e.enemy_list_basename.c_str(), e.event_list_basename.c_str()));
       }
     }
   }
+  return join(lines, "");
 }
 
 struct AreaMapFileInfo {
@@ -1715,23 +1848,97 @@ struct AreaMapFileInfo {
         variation2_values(variation2_values) {}
 };
 
+const array<vector<vector<string>>, 0x10> SetDataTableDCNTE::NAMES = {{
+    /* 00 */ {{"map_city00_00"}},
+    /* 01 */ {{"map_forest01_00", "map_forest01_01"}},
+    /* 02 */ {{"map_forest02_00", "map_forest02_03"}},
+    /* 03 */ {{"map_cave01_00_00", "map_cave01_00_01"}, {"map_cave01_01_00", "map_cave01_01_01"}},
+    /* 04 */ {{"map_cave02_00_00", "map_cave02_00_01"}, {"map_cave02_01_00", "map_cave02_01_01"}},
+    /* 05 */ {{"map_cave03_00_00", "map_cave03_00_01"}, {"map_cave03_01_00", "map_cave03_01_01"}},
+    /* 06 */ {{"map_machine01_00_00", "map_machine01_00_01"}},
+    /* 07 */ {{"map_machine02_00_00", "map_machine02_00_01"}},
+    /* 08 */ {{"map_ancient01_00_00", "map_ancient01_00_01"}, {"map_ancient01_01_00", "map_ancient01_01_01"}},
+    /* 09 */ {{"map_ancient02_00_00", "map_ancient02_00_01"}, {"map_ancient02_01_00", "map_ancient02_01_01"}},
+    /* 0A */ {{"map_ancient03_00_00", "map_ancient03_00_01"}, {"map_ancient03_01_00", "map_ancient03_01_01"}},
+    /* 0B */ {{"map_boss01"}},
+    /* 0C */ {{"map_boss02"}},
+    /* 0D */ {{"map_boss03"}},
+    /* 0E */ {{"map_boss04"}},
+    /* 0F */ {{"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}},
+}};
+
+SetDataTableDCNTE::SetDataTableDCNTE() : SetDataTableBase(Version::DC_NTE) {}
+
+pair<uint32_t, uint32_t> SetDataTableDCNTE::num_available_variations_for_floor(Episode, uint8_t floor) const {
+  return make_pair(this->NAMES[floor].size(), this->NAMES[floor][0].size());
+}
+
+pair<uint32_t, uint32_t> SetDataTableDCNTE::num_free_roam_variations_for_floor(Episode episode, bool, uint8_t floor) const {
+  return this->num_available_variations_for_floor(episode, floor);
+}
+
+string SetDataTableDCNTE::map_filename_for_variation(
+    uint8_t floor, uint32_t var1, uint32_t var2, Episode, GameMode, bool is_enemies) const {
+  if (floor >= this->NAMES.size()) {
+    return "";
+  }
+  return this->NAMES.at(floor).at(var1).at(var2) + (is_enemies ? "e.dat" : "o.dat");
+}
+
+const array<vector<vector<string>>, 0x10> SetDataTableDC112000::NAMES = {{
+    /* 00 */ {{"map_city00_00"}},
+    /* 01 */ {{"map_forest01_00", "map_forest01_01", "map_forest01_02", "map_forest01_03", "map_forest01_04"}},
+    /* 02 */ {{"map_forest02_00", "map_forest02_01", "map_forest02_02", "map_forest02_03", "map_forest02_04"}},
+    /* 03 */ {{"map_cave01_00_00", "map_cave01_00_01"}, {"map_cave01_01_00", "map_cave01_01_01"}, {"map_cave01_02_00", "map_cave01_02_01"}},
+    /* 04 */ {{"map_cave02_00_00", "map_cave02_00_01"}, {"map_cave02_01_00", "map_cave02_01_01"}, {"map_cave02_02_00", "map_cave02_02_01"}},
+    /* 05 */ {{"map_cave03_00_00", "map_cave03_00_01"}, {"map_cave03_01_00", "map_cave03_01_01"}, {"map_cave03_02_00", "map_cave03_02_01"}},
+    /* 06 */ {{"map_machine01_00_00", "map_machine01_00_01"}, {"map_machine01_01_00", "map_machine01_01_01"}, {"map_machine01_02_00", "map_machine01_02_01"}},
+    /* 07 */ {{"map_machine02_00_00", "map_machine02_00_01"}, {"map_machine02_01_00", "map_machine02_01_01"}, {"map_machine02_02_00", "map_machine02_02_01"}},
+    /* 08 */ {{"map_ancient01_00_00", "map_ancient01_00_01"}, {"map_ancient01_01_00", "map_ancient01_01_01"}, {"map_ancient01_02_00", "map_ancient01_02_01"}},
+    /* 09 */ {{"map_ancient02_00_00", "map_ancient02_00_01"}, {"map_ancient02_01_00", "map_ancient02_01_01"}, {"map_ancient02_02_00", "map_ancient02_02_01"}},
+    /* 0A */ {{"map_ancient03_00_00", "map_ancient03_00_01"}, {"map_ancient03_01_00", "map_ancient03_01_01"}, {"map_ancient03_02_00", "map_ancient03_02_01"}},
+    /* 0B */ {{"map_boss01"}},
+    /* 0C */ {{"map_boss02"}},
+    /* 0D */ {{"map_boss03"}},
+    /* 0E */ {{"map_boss04"}},
+    /* 0F */ {{"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}, {"map_visuallobby"}},
+}};
+
+SetDataTableDC112000::SetDataTableDC112000() : SetDataTableBase(Version::DC_V1_11_2000_PROTOTYPE) {}
+
+pair<uint32_t, uint32_t> SetDataTableDC112000::num_available_variations_for_floor(Episode, uint8_t floor) const {
+  return make_pair(this->NAMES[floor].size(), this->NAMES[floor][0].size());
+}
+
+pair<uint32_t, uint32_t> SetDataTableDC112000::num_free_roam_variations_for_floor(Episode episode, bool, uint8_t floor) const {
+  return this->num_available_variations_for_floor(episode, floor);
+}
+
+string SetDataTableDC112000::map_filename_for_variation(
+    uint8_t floor, uint32_t var1, uint32_t var2, Episode, GameMode, bool is_enemies) const {
+  if (floor >= this->NAMES.size()) {
+    return "";
+  }
+  return this->NAMES.at(floor).at(var1).at(var2) + (is_enemies ? "e.dat" : "o.dat");
+}
+
 static const vector<AreaMapFileInfo> map_file_info_dc_nte = {
     {"city00", {}, {0}},
-    {"forest01", {}, {0, 1, 2, 3, 4}},
-    {"forest02", {}, {0, 1, 2, 3, 4}},
-    {"cave01", {0, 1, 2}, {0, 1}},
-    {"cave02", {0, 1, 2}, {0, 1}},
-    {"cave03", {0, 1, 2}, {0, 1}},
-    {"machine01", {0, 1}, {0, 1}},
-    {"machine02", {0, 1}, {0, 1}},
-    {"ancient01", {0, 1}, {0, 1}},
-    {"ancient02", {0, 1}, {0, 1}},
-    {"ancient03", {0, 1}, {0, 1}},
+    {"forest01", {}, {0, 1}},
+    {"forest02", {}, {0, 3}},
+    {"cave01", {0, 1}, {0, 1}},
+    {"cave02", {0, 1}, {0, 1}},
+    {"cave03", {0, 1}, {0, 1}},
+    {"machine01", {0}, {0, 1}},
+    {"machine02", {0}, {0, 1}},
+    {"ancient01", {0}, {0, 1}},
+    {"ancient02", {0}, {0, 1}},
+    {"ancient03", {0}, {0, 1}},
     {"boss01", {}, {}},
     {"boss02", {}, {}},
     {"boss03", {}, {}},
     {"boss04", {}, {}},
-    {nullptr, {}, {}},
+    {"map_visuallobby", {}, {}},
 };
 
 static const vector<vector<AreaMapFileInfo>> map_file_info_gc_nte = {
@@ -1752,13 +1959,13 @@ static const vector<vector<AreaMapFileInfo>> map_file_info_gc_nte = {
         {"boss02", {}, {}},
         {"boss03", {}, {}},
         {"boss04", {}, {}},
-        {nullptr, {}, {}},
+        {"lobby_01", {}, {}},
     },
     {
         // Episode 2 Non-solo
         {"labo00", {}, {0}},
-        {"ruins01", {0, 1}, {0}},
-        {"ruins02", {0, 1}, {0}},
+        {"ruins01", {0}, {0}},
+        {"ruins02", {0}, {0}},
         {"space01", {0, 1}, {0}},
         {"space02", {0, 1}, {0}},
         {"jungle01", {}, {0, 1}},
@@ -1766,8 +1973,8 @@ static const vector<vector<AreaMapFileInfo>> map_file_info_gc_nte = {
         {"jungle03", {}, {0, 1}},
         {"jungle04", {0, 1}, {0}},
         {"jungle05", {}, {0, 1}},
-        {nullptr, {}, {}},
-        {nullptr, {}, {}},
+        {"seabed01", {0, 1}, {0}},
+        {"seabed02", {0}, {0}},
         {"boss05", {}, {}},
         {"boss06", {}, {}},
         {"boss07", {}, {}},
@@ -1796,7 +2003,7 @@ static const vector<vector<vector<AreaMapFileInfo>>> map_file_info = {
             {"boss02", {}, {}},
             {"boss03", {}, {}},
             {"boss04", {}, {}},
-            {nullptr, {}, {}},
+            {"lobby_01", {}, {}},
         },
         {
             // Solo
@@ -1873,7 +2080,7 @@ static const vector<vector<vector<AreaMapFileInfo>>> map_file_info = {
             {"desert02", {0}, {0, 1, 2}},
             {"desert03", {0, 1, 2}, {0}},
             {"boss09", {0}, {0}},
-            {nullptr, {}, {}},
+            {"test01", {0}, {0}},
             {nullptr, {}, {}},
             {nullptr, {}, {}},
             {nullptr, {}, {}},
@@ -1892,7 +2099,7 @@ static const vector<vector<vector<AreaMapFileInfo>>> map_file_info = {
             {"desert02", {0}, {0, 1, 2}},
             {"desert03", {0, 1, 2}, {0}},
             {"boss09", {0}, {0}},
-            {nullptr, {}, {}},
+            {"test01", {0}, {0}},
             {nullptr, {}, {}},
             {nullptr, {}, {}},
             {nullptr, {}, {}},
@@ -1902,7 +2109,7 @@ static const vector<vector<vector<AreaMapFileInfo>>> map_file_info = {
     },
 };
 
-const AreaMapFileInfo& file_info_for_variation(
+const AreaMapFileInfo& file_info_for_variation_deprecated(
     Version version, Episode episode, uint8_t area, bool is_solo) {
   const vector<AreaMapFileInfo>* multi_index = nullptr;
   const vector<AreaMapFileInfo>* solo_index = nullptr;
@@ -1919,8 +2126,7 @@ const AreaMapFileInfo& file_info_for_variation(
       default:
         throw invalid_argument("episode has no maps");
     }
-  }
-   else {
+  } else {
     switch (episode) {
       case Episode::EP1:
         multi_index = &map_file_info.at(0).at(0);
@@ -1952,14 +2158,14 @@ const AreaMapFileInfo& file_info_for_variation(
   return multi_index->at(area);
 }
 
-void generate_variations(
+void generate_variations_deprecated(
     parray<le_uint32_t, 0x20>& variations,
     shared_ptr<PSOLFGEncryption> random_crypt,
     Version version,
     Episode episode,
     bool is_solo) {
   for (size_t z = 0; z < 0x10; z++) {
-    const auto& a = file_info_for_variation(version, episode, z, is_solo);
+    const auto& a = file_info_for_variation_deprecated(version, episode, z, is_solo);
     if (!a.name_token) {
       variations[z * 2 + 0] = 0;
       variations[z * 2 + 1] = 0;
@@ -1970,10 +2176,10 @@ void generate_variations(
   }
 }
 
-vector<parray<le_uint32_t, 0x20>> generate_all_possible_variations(Version version, Episode episode, bool is_solo) {
-  parray<uint32_t, 0x20> maxes;
+parray<le_uint32_t, 0x20> variation_maxes_deprecated(Version version, Episode episode, bool is_solo) {
+  parray<le_uint32_t, 0x20> maxes;
   for (size_t z = 0; z < 0x10; z++) {
-    const auto& a = file_info_for_variation(version, episode, z, is_solo);
+    const auto& a = file_info_for_variation_deprecated(version, episode, z, is_solo);
     if (!a.name_token) {
       maxes[z * 2 + 0] = 0;
       maxes[z * 2 + 1] = 0;
@@ -1982,38 +2188,32 @@ vector<parray<le_uint32_t, 0x20>> generate_all_possible_variations(Version versi
       maxes[z * 2 + 1] = (a.variation2_values.size() <= 1) ? 0 : (a.variation2_values.size() - 1);
     }
   }
-
-  vector<parray<le_uint32_t, 0x20>> ret;
-  parray<le_uint32_t, 0x20> current;
-  for (;;) {
-    ret.emplace_back(current);
-
-    // Increment current by 1 as if it were an 0x20-place integer, with each
-    // "place" having a base of maxes[x] + 1
-    ssize_t x;
-    for (x = 0x1F; x >= 0; x--) {
-      if (current[x] < maxes[x]) {
-        current[x]++;
-        break;
-      } else {
-        current[x] = 0;
-      }
-    }
-    if (x < 0) {
-      break;
-    }
-  }
-
-  return ret;
+  return maxes;
 }
 
-vector<string> map_filenames_for_variation(
-    Version version,
-    Episode episode,
-    GameMode mode,
+bool next_variation_deprecated(parray<le_uint32_t, 0x20>& variations, Version version, Episode episode, bool is_solo) {
+  auto maxes = variation_maxes_deprecated(version, episode, is_solo);
+
+  // Increment variations by 1 as if it were an 0x20-place integer, with each
+  // "place" having a base of maxes[x] + 1
+  for (ssize_t x = 0x1F; x >= 0; x--) {
+    if (variations[x] < maxes[x]) {
+      variations[x]++;
+      return true;
+    } else {
+      variations[x] = 0;
+    }
+  }
+  return false;
+}
+
+vector<string> map_filenames_for_variation_deprecated(
     uint8_t floor,
     uint32_t var1,
     uint32_t var2,
+    Version version,
+    Episode episode,
+    GameMode mode,
     bool is_enemies) {
   // Map filenames are like map_<name_token>_<VV>_<VV>(_off)?(e|o)(_s|_c1)?.dat
   //   name_token comes from AreaMapFileInfo
@@ -2024,7 +2224,7 @@ vector<string> map_filenames_for_variation(
   //   _c1 is used for the city map in Challenge mode (which we don't load,
   //     since it contains only NPCs and not enemies)
   //   e|o specifies what kind of data: e = enemies, o = objects
-  const auto& a = file_info_for_variation(version, episode, floor, mode == GameMode::SOLO);
+  const auto& a = file_info_for_variation_deprecated(version, episode, floor, mode == GameMode::SOLO);
   if (!a.name_token) {
     return vector<string>();
   }
@@ -2067,5 +2267,18 @@ vector<string> map_filenames_for_variation(
   return ret;
 }
 
+vector<vector<string>> map_filenames_for_variations_deprecated(
+    const parray<le_uint32_t, 0x20>& variations,
+    Version version,
+    Episode episode,
+    GameMode mode,
+    bool is_enemies) {
+  vector<vector<string>> ret;
+  for (size_t z = 0; z < 0x10; z++) {
+    ret.emplace_back(map_filenames_for_variation_deprecated(z, variations[z * 2], variations[z * 2 + 1], version, episode, mode, is_enemies));
+  }
+  return ret;
+}
+
 const shared_ptr<const Map::RareEnemyRates> Map::NO_RARE_ENEMIES = make_shared<Map::RareEnemyRates>(0, 0);
 const shared_ptr<const Map::RareEnemyRates> Map::DEFAULT_RARE_ENEMIES = make_shared<Map::RareEnemyRates>(0x0083126E, 0x1999999A);
diff --git a/src/Map.hh b/src/Map.hh
index 18db5475..a6088507 100644
--- a/src/Map.hh
+++ b/src/Map.hh
@@ -321,11 +321,28 @@ struct Map {
   std::vector<size_t> rare_enemy_indexes;
 };
 
-// TODO: This class is currently unused. It would be nice if we could use this
-// to generate variations and link to the corresponding map filenames, but it
-// seems that SetDataTable.rel files link to map filenames that don't actually
-// exist in some cases, so we can't just directly use this data structure.
-class SetDataTable {
+class SetDataTableBase {
+public:
+  virtual ~SetDataTableBase() = default;
+
+  parray<le_uint32_t, 0x20> generate_variations(Episode episode, bool is_solo, std::shared_ptr<PSOLFGEncryption> random_crypt) const;
+  virtual std::pair<uint32_t, uint32_t> num_available_variations_for_floor(Episode episode, uint8_t floor) const = 0;
+  virtual std::pair<uint32_t, uint32_t> num_free_roam_variations_for_floor(Episode episode, bool is_solo, uint8_t floor) const = 0;
+
+  virtual std::string map_filename_for_variation(
+      uint8_t floor, uint32_t var1, uint32_t var2, Episode episode, GameMode mode, bool is_enemies) const = 0;
+  std::vector<std::string> map_filenames_for_variations(
+      const parray<le_uint32_t, 0x20>& variations, Episode episode, GameMode mode, bool is_enemies) const;
+
+  uint8_t default_area_for_floor(Episode episode, uint8_t floor) const;
+
+protected:
+  explicit SetDataTableBase(Version version);
+
+  Version version;
+};
+
+class SetDataTable : public SetDataTableBase {
 public:
   struct SetEntry {
     std::string object_list_basename;
@@ -333,31 +350,68 @@ public:
     std::string event_list_basename;
   };
 
-  SetDataTable(std::shared_ptr<const std::string> data, bool big_endian);
+  SetDataTable(Version version, const std::string& data);
+  virtual ~SetDataTable() = default;
 
-  inline const std::vector<std::vector<std::vector<SetEntry>>> get() const {
-    return this->entries;
-  }
+  virtual std::pair<uint32_t, uint32_t> num_available_variations_for_floor(Episode episode, uint8_t floor) const;
+  virtual std::pair<uint32_t, uint32_t> num_free_roam_variations_for_floor(Episode episode, bool is_solo, uint8_t floor) const;
+  virtual std::string map_filename_for_variation(
+      uint8_t floor, uint32_t var1, uint32_t var2, Episode episode, GameMode mode, bool is_enemies) const;
 
-  void print(FILE* stream) const;
+  std::string str() const;
 
 private:
   template <bool IsBigEndian>
-  void load_table_t(std::shared_ptr<const std::string> data);
+  void load_table_t(const std::string& data);
 
   // Indexes are [floor][variation1][variation2]
   // floor is cumulative per episode, so Ep2 starts at floor=18.
   std::vector<std::vector<std::vector<SetEntry>>> entries;
 };
 
-void generate_variations(
+class SetDataTableDCNTE : public SetDataTableBase {
+public:
+  SetDataTableDCNTE();
+  virtual ~SetDataTableDCNTE() = default;
+
+  virtual std::pair<uint32_t, uint32_t> num_available_variations_for_floor(Episode episode, uint8_t floor) const;
+  virtual std::pair<uint32_t, uint32_t> num_free_roam_variations_for_floor(Episode episode, bool is_solo, uint8_t floor) const;
+  virtual std::string map_filename_for_variation(
+      uint8_t floor, uint32_t var1, uint32_t var2, Episode episode, GameMode mode, bool is_enemies) const;
+
+private:
+  static const std::array<std::vector<std::vector<std::string>>, 0x10> NAMES;
+};
+
+class SetDataTableDC112000 : public SetDataTableBase {
+public:
+  SetDataTableDC112000();
+  virtual ~SetDataTableDC112000() = default;
+
+  virtual std::pair<uint32_t, uint32_t> num_available_variations_for_floor(Episode episode, uint8_t floor) const;
+  virtual std::pair<uint32_t, uint32_t> num_free_roam_variations_for_floor(Episode episode, bool is_solo, uint8_t floor) const;
+  virtual std::string map_filename_for_variation(
+      uint8_t floor, uint32_t var1, uint32_t var2, Episode episode, GameMode mode, bool is_enemies) const;
+
+private:
+  static const std::array<std::vector<std::vector<std::string>>, 0x10> NAMES;
+};
+
+void generate_variations_deprecated(
     parray<le_uint32_t, 0x20>& variations,
     std::shared_ptr<PSOLFGEncryption> random,
     Version version,
     Episode episode,
     bool is_solo);
-std::vector<parray<le_uint32_t, 0x20>> generate_all_possible_variations(
-    Version version, Episode episode, bool is_solo);
 
-std::vector<std::string> map_filenames_for_variation(
-    Version version, Episode episode, GameMode mode, uint8_t floor, uint32_t var1, uint32_t var2, bool is_enemies);
+parray<le_uint32_t, 0x20> variation_maxes_deprecated(Version version, Episode episode, bool is_solo);
+bool next_variation_deprecated(parray<le_uint32_t, 0x20>& variations, Version version, Episode episode, bool is_solo);
+
+std::vector<std::string> map_filenames_for_variation_deprecated(
+    uint8_t floor, uint32_t var1, uint32_t var2, Version version, Episode episode, GameMode mode, bool is_enemies);
+std::vector<std::vector<std::string>> map_filenames_for_variations_deprecated(
+    const parray<le_uint32_t, 0x20>& variations,
+    Version version,
+    Episode episode,
+    GameMode mode,
+    bool is_enemies);
diff --git a/src/ReceiveCommands.cc b/src/ReceiveCommands.cc
index 2616d24d..b2664df3 100644
--- a/src/ReceiveCommands.cc
+++ b/src/ReceiveCommands.cc
@@ -4200,8 +4200,19 @@ shared_ptr<Lobby> create_game_generic(
     game->rare_enemy_rates = s->rare_enemy_rates_by_difficulty.at(game->difficulty);
   }
 
-  generate_variations(game->variations, game->random_crypt, game->base_version, game->episode, is_solo);
-  game->load_maps();
+  if (game->episode != Episode::EP3) {
+    // GC NTE ignores the passed-in variations and always uses all zeroes
+    if (game->base_version != Version::GC_NTE) {
+      auto sdt = s->set_data_table(game->base_version, game->episode, game->mode, game->difficulty);
+      game->variations = sdt->generate_variations(game->episode, is_solo, game->random_crypt);
+    } else {
+      game->variations.clear(0);
+    }
+    game->load_maps();
+  } else {
+    game->variations.clear(0);
+    game->map = make_shared<Map>(game->base_version, game->lobby_id, game->random_crypt);
+  }
 
   return game;
 }
diff --git a/src/ServerState.cc b/src/ServerState.cc
index 16339f34..2e000cb4 100644
--- a/src/ServerState.cc
+++ b/src/ServerState.cc
@@ -31,8 +31,8 @@ ServerState::QuestF960Result::QuestF960Result(const JSON& json, std::shared_ptr<
 }
 
 ServerState::ServerState(const string& config_filename)
-  : creation_time(now()),
-    config_filename(config_filename) {
+    : creation_time(now()),
+      config_filename(config_filename) {
   this->create_load_step_graph();
 }
 
@@ -371,6 +371,21 @@ void ServerState::dispatch_destroy_lobbies(evutil_socket_t, short, void* ctx) {
   reinterpret_cast<ServerState*>(ctx)->lobbies_to_destroy.clear();
 }
 
+shared_ptr<const SetDataTableBase> ServerState::set_data_table(
+    Version version, Episode episode, GameMode mode, uint8_t difficulty) const {
+  bool use_ult_tables = ((episode == Episode::EP1) && (difficulty == 3) && !is_v1(version) && (version != Version::PC_NTE));
+  if (mode == GameMode::SOLO && is_v4(version)) {
+    return use_ult_tables ? this->bb_solo_set_data_table_ep1_ult : this->bb_solo_set_data_table;
+  }
+
+  const auto& tables = use_ult_tables ? this->set_data_tables_ep1_ult : this->set_data_tables;
+  auto ret = tables.at(static_cast<size_t>(version));
+  if (ret == nullptr) {
+    throw runtime_error("no set data table exists for this version");
+  }
+  return ret;
+}
+
 shared_ptr<const ItemParameterTable> ServerState::item_parameter_table(Version version) const {
   auto ret = this->item_parameter_tables.at(static_cast<size_t>(version));
   if (ret == nullptr) {
@@ -450,11 +465,8 @@ shared_ptr<const string> ServerState::load_bb_file(
     // First, look in the patch tree's data directory
     string patch_index_path = "./data/" + patch_index_filename;
     try {
-      auto ret = this->bb_patch_file_index->get(patch_index_path)->load_data();
-      static_game_data_log.info("Loaded %s from file in BB patch tree", patch_index_path.c_str());
-      return ret;
+      return this->bb_patch_file_index->get(patch_index_path)->load_data();
     } catch (const out_of_range&) {
-      static_game_data_log.info("%s missing from BB patch tree", patch_index_path.c_str());
     }
   }
 
@@ -464,11 +476,8 @@ shared_ptr<const string> ServerState::load_bb_file(
     try {
       // TODO: It's kinda not great that we copy the data here; find a way to
       // avoid doing this (also in the below case)
-      auto ret = make_shared<string>(this->bb_data_gsl->get_copy(effective_gsl_filename));
-      static_game_data_log.info("Loaded %s from data.gsl in BB patch tree", effective_gsl_filename.c_str());
-      return ret;
+      return make_shared<string>(this->bb_data_gsl->get_copy(effective_gsl_filename));
     } catch (const out_of_range&) {
-      static_game_data_log.info("%s missing from data.gsl in BB patch tree", effective_gsl_filename.c_str());
     }
 
     // Third, look in data.gsl without the filename extension
@@ -476,11 +485,8 @@ shared_ptr<const string> ServerState::load_bb_file(
     if (dot_offset != string::npos) {
       string no_ext_gsl_filename = effective_gsl_filename.substr(0, dot_offset);
       try {
-        auto ret = make_shared<string>(this->bb_data_gsl->get_copy(no_ext_gsl_filename));
-        static_game_data_log.info("Loaded %s from data.gsl in BB patch tree", no_ext_gsl_filename.c_str());
-        return ret;
+        return make_shared<string>(this->bb_data_gsl->get_copy(no_ext_gsl_filename));
       } catch (const out_of_range&) {
-        static_game_data_log.info("%s missing from data.gsl in BB patch tree", no_ext_gsl_filename.c_str());
       }
     }
   }
@@ -490,11 +496,8 @@ shared_ptr<const string> ServerState::load_bb_file(
   static FileContentsCache cache(10 * 60 * 1000 * 1000); // 10 minutes
   try {
     auto ret = cache.get_or_load("system/blueburst/" + effective_bb_directory_filename);
-    static_game_data_log.info("Loaded %s", effective_bb_directory_filename.c_str());
     return ret.file->data;
   } catch (const exception& e) {
-    static_game_data_log.info("%s missing from system/blueburst", effective_bb_directory_filename.c_str());
-    static_game_data_log.error("%s not found in any source", patch_index_filename.c_str());
     throw cannot_open_file(patch_index_filename);
   }
 }
@@ -509,25 +512,20 @@ shared_ptr<const string> ServerState::load_map_file_uncached(Version version, co
     try {
       return this->load_bb_file(filename);
     } catch (const exception& e) {
-      static_game_data_log.info("Failed to load %s from BB patch tree: %s", filename.c_str(), e.what());
     }
   } else if (version == Version::PC_V2) {
     try {
       string path = "system/patch-pc/Media/PSO/" + filename;
       auto ret = make_shared<string>(load_file(path));
-      static_game_data_log.info("Loaded %s from PC patch tree", filename.c_str());
       return ret;
     } catch (const exception& e) {
-      static_game_data_log.info("Failed to load %s from PC patch tree: %s", filename.c_str(), e.what());
     }
   }
   try {
     string path = string_printf("system/maps/%s/%s", file_path_token_for_version(version), filename.c_str());
     auto ret = make_shared<string>(load_file(path));
-    static_game_data_log.info("Loaded %s from default maps", filename.c_str());
     return ret;
   } catch (const exception& e) {
-    static_game_data_log.info("Failed to load %s from default maps: %s", filename.c_str(), e.what());
   }
   return nullptr;
 }
@@ -1129,6 +1127,36 @@ void ServerState::clear_map_file_caches() {
   }
 }
 
+void ServerState::load_set_data_tables() {
+  config_log.info("Loading set data tables");
+  std::array<std::shared_ptr<const SetDataTableBase>, NUM_VERSIONS> set_data_tables;
+
+  auto load_table = [this](Version version) -> void {
+    auto data = this->load_map_file(version, "SetDataTableOn.rel");
+    this->set_data_tables[static_cast<size_t>(version)] = make_shared<SetDataTable>(version, *data);
+    if (!is_v1(version) && (version != Version::PC_NTE)) {
+      auto data_ep1_ult = this->load_map_file(version, "SetDataTableOnUlti.rel");
+      this->set_data_tables_ep1_ult[static_cast<size_t>(version)] = make_shared<SetDataTable>(version, *data_ep1_ult);
+    }
+  };
+
+  this->set_data_tables[static_cast<size_t>(Version::DC_NTE)] = make_shared<SetDataTableDCNTE>();
+  this->set_data_tables[static_cast<size_t>(Version::DC_V1_11_2000_PROTOTYPE)] = make_shared<SetDataTableDC112000>();
+  load_table(Version::DC_V1);
+  load_table(Version::DC_V2);
+  load_table(Version::PC_NTE);
+  load_table(Version::PC_V2);
+  load_table(Version::GC_NTE);
+  load_table(Version::GC_V3);
+  load_table(Version::XB_V3);
+  load_table(Version::BB_V4);
+
+  auto bb_solo_data = this->load_map_file(Version::BB_V4, "SetDataTableOff.rel");
+  this->bb_solo_set_data_table = make_shared<SetDataTable>(Version::BB_V4, *bb_solo_data);
+  auto bb_solo_data_ep1_ult = this->load_map_file(Version::BB_V4, "SetDataTableOffUlti.rel");
+  this->bb_solo_set_data_table_ep1_ult = make_shared<SetDataTable>(Version::BB_V4, *bb_solo_data_ep1_ult);
+}
+
 void ServerState::load_battle_params() {
   config_log.info("Loading battle parameters");
   this->battle_params = make_shared<BattleParamsIndex>(
@@ -1505,6 +1533,10 @@ void ServerState::create_load_step_graph() {
   // Out: lobbies
   this->load_step_graph.add_step("lobbies", {"all"}, bind(&ServerState::create_default_lobbies, this));
 
+  // In: bb_patch_file_index
+  // Out: set_data_tables
+  this->load_step_graph.add_step("set_data_tables", {"all", "patch_indexes"}, bind(&ServerState::load_set_data_tables, this));
+
   // In: bb_patch_file_index
   // Out: battle_params
   this->load_step_graph.add_step("battle_params", {"all", "patch_indexes"}, bind(&ServerState::load_battle_params, this));
diff --git a/src/ServerState.hh b/src/ServerState.hh
index de27ebf1..ead8d29c 100644
--- a/src/ServerState.hh
+++ b/src/ServerState.hh
@@ -148,6 +148,10 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   std::shared_ptr<const TextIndex> text_index;
   std::array<std::shared_ptr<const ItemNameIndex>, NUM_VERSIONS> item_name_indexes;
   std::shared_ptr<const WordSelectTable> word_select_table;
+  std::array<std::shared_ptr<const SetDataTableBase>, NUM_VERSIONS> set_data_tables;
+  std::array<std::shared_ptr<const SetDataTableBase>, NUM_VERSIONS> set_data_tables_ep1_ult;
+  std::shared_ptr<const SetDataTableBase> bb_solo_set_data_table;
+  std::shared_ptr<const SetDataTableBase> bb_solo_set_data_table_ep1_ult;
   std::array<std::shared_ptr<const Map::RareEnemyRates>, 4> rare_enemy_rates_by_difficulty;
   std::shared_ptr<const Map::RareEnemyRates> rare_enemy_rates_challenge;
   std::array<std::array<size_t, 4>, 3> min_levels_v4; // Indexed as [episode][difficulty]
@@ -272,6 +276,8 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   std::shared_ptr<const Menu> proxy_destinations_menu(Version version) const;
   const std::vector<std::pair<std::string, uint16_t>>& proxy_destinations(Version version) const;
 
+  std::shared_ptr<const SetDataTableBase> set_data_table(Version version, Episode episode, GameMode mode, uint8_t difficulty) const;
+
   std::shared_ptr<const ItemParameterTable> item_parameter_table(Version version) const;
   std::shared_ptr<const ItemParameterTable> item_parameter_table_for_encode(Version version) const;
   void set_item_parameter_table(Version version, std::shared_ptr<const ItemParameterTable> table);
@@ -314,6 +320,7 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   void load_item_name_indexes();
   void load_drop_tables();
   void load_item_definitions();
+  void load_set_data_tables();
   void load_word_select_table();
   void load_ep3_data();
   void load_quest_index();
diff --git a/system/maps/bb-v4/SetDataTableOff.rel b/system/maps/bb-v4/SetDataTableOff.rel
new file mode 100644
index 00000000..0705d70a
Binary files /dev/null and b/system/maps/bb-v4/SetDataTableOff.rel differ
diff --git a/system/maps/bb-v4/SetDataTableOffUlti.rel b/system/maps/bb-v4/SetDataTableOffUlti.rel
new file mode 100755
index 00000000..cb9f9e5d
Binary files /dev/null and b/system/maps/bb-v4/SetDataTableOffUlti.rel differ
diff --git a/system/maps/bb-v4/SetDataTableOn.rel b/system/maps/bb-v4/SetDataTableOn.rel
new file mode 100644
index 00000000..7edf6c7a
Binary files /dev/null and b/system/maps/bb-v4/SetDataTableOn.rel differ
diff --git a/system/maps/bb-v4/SetDataTableOnUlti.rel b/system/maps/bb-v4/SetDataTableOnUlti.rel
new file mode 100755
index 00000000..7e8118a2
Binary files /dev/null and b/system/maps/bb-v4/SetDataTableOnUlti.rel differ
diff --git a/system/maps/bb-v4/map_city02_00_00e_c1.dat b/system/maps/bb-v4/map_city02_00_00e_c1.dat
new file mode 120000
index 00000000..5580ba73
--- /dev/null
+++ b/system/maps/bb-v4/map_city02_00_00e_c1.dat
@@ -0,0 +1 @@
+map_city02_00_00e.dat
\ No newline at end of file
diff --git a/system/maps/bb-v4/map_city02_00_00e_d.dat b/system/maps/bb-v4/map_city02_00_00e_d.dat
new file mode 120000
index 00000000..5580ba73
--- /dev/null
+++ b/system/maps/bb-v4/map_city02_00_00e_d.dat
@@ -0,0 +1 @@
+map_city02_00_00e.dat
\ No newline at end of file
diff --git a/system/maps/bb-v4/map_city02_00_00o_c1.dat b/system/maps/bb-v4/map_city02_00_00o_c1.dat
new file mode 120000
index 00000000..39199e78
--- /dev/null
+++ b/system/maps/bb-v4/map_city02_00_00o_c1.dat
@@ -0,0 +1 @@
+map_city02_00_00o.dat
\ No newline at end of file
diff --git a/system/maps/bb-v4/map_city02_00_00o_d.dat b/system/maps/bb-v4/map_city02_00_00o_d.dat
new file mode 120000
index 00000000..39199e78
--- /dev/null
+++ b/system/maps/bb-v4/map_city02_00_00o_d.dat
@@ -0,0 +1 @@
+map_city02_00_00o.dat
\ No newline at end of file
diff --git a/system/maps/bb-v4/map_test01_00_00e.dat b/system/maps/bb-v4/map_test01_00_00e.dat
new file mode 100644
index 00000000..e69de29b
diff --git a/system/maps/bb-v4/map_test01_00_00o.dat b/system/maps/bb-v4/map_test01_00_00o.dat
new file mode 100644
index 00000000..e69de29b
diff --git a/system/maps/dc-v1/SetDataTableOff.rel b/system/maps/dc-v1/SetDataTableOff.rel
new file mode 100644
index 00000000..e1b7e740
Binary files /dev/null and b/system/maps/dc-v1/SetDataTableOff.rel differ
diff --git a/system/maps/dc-v1/SetDataTableOn.rel b/system/maps/dc-v1/SetDataTableOn.rel
new file mode 100644
index 00000000..5b33adf9
Binary files /dev/null and b/system/maps/dc-v1/SetDataTableOn.rel differ
diff --git a/system/maps/dc-v2/SetDataTableGAMEJAM.rel b/system/maps/dc-v2/SetDataTableGAMEJAM.rel
new file mode 100644
index 00000000..e776d522
Binary files /dev/null and b/system/maps/dc-v2/SetDataTableGAMEJAM.rel differ
diff --git a/system/maps/dc-v2/SetDataTableOff.rel b/system/maps/dc-v2/SetDataTableOff.rel
new file mode 100644
index 00000000..60df6dcf
Binary files /dev/null and b/system/maps/dc-v2/SetDataTableOff.rel differ
diff --git a/system/maps/dc-v2/SetDataTableOffUlti.rel b/system/maps/dc-v2/SetDataTableOffUlti.rel
new file mode 100644
index 00000000..6000d05e
Binary files /dev/null and b/system/maps/dc-v2/SetDataTableOffUlti.rel differ
diff --git a/system/maps/dc-v2/SetDataTableOn.rel b/system/maps/dc-v2/SetDataTableOn.rel
new file mode 100644
index 00000000..460e3a4c
Binary files /dev/null and b/system/maps/dc-v2/SetDataTableOn.rel differ
diff --git a/system/maps/dc-v2/SetDataTableOnUlti.rel b/system/maps/dc-v2/SetDataTableOnUlti.rel
new file mode 100644
index 00000000..71c623e5
Binary files /dev/null and b/system/maps/dc-v2/SetDataTableOnUlti.rel differ
diff --git a/system/maps/gc-nte/SetDataTableGAMEJAM.rel b/system/maps/gc-nte/SetDataTableGAMEJAM.rel
new file mode 100755
index 00000000..46d5baab
Binary files /dev/null and b/system/maps/gc-nte/SetDataTableGAMEJAM.rel differ
diff --git a/system/maps/gc-nte/SetDataTableOff.rel b/system/maps/gc-nte/SetDataTableOff.rel
new file mode 100755
index 00000000..af661cec
Binary files /dev/null and b/system/maps/gc-nte/SetDataTableOff.rel differ
diff --git a/system/maps/gc-nte/SetDataTableOffUlti.rel b/system/maps/gc-nte/SetDataTableOffUlti.rel
new file mode 100755
index 00000000..431bd30e
Binary files /dev/null and b/system/maps/gc-nte/SetDataTableOffUlti.rel differ
diff --git a/system/maps/gc-nte/SetDataTableOn.rel b/system/maps/gc-nte/SetDataTableOn.rel
new file mode 100755
index 00000000..3e2f931e
Binary files /dev/null and b/system/maps/gc-nte/SetDataTableOn.rel differ
diff --git a/system/maps/gc-nte/SetDataTableOnUlti.rel b/system/maps/gc-nte/SetDataTableOnUlti.rel
new file mode 100755
index 00000000..8cfd23d9
Binary files /dev/null and b/system/maps/gc-nte/SetDataTableOnUlti.rel differ
diff --git a/system/maps/gc-nte/SetDataTable_TGS2001.rel b/system/maps/gc-nte/SetDataTable_TGS2001.rel
new file mode 100755
index 00000000..2945b416
Binary files /dev/null and b/system/maps/gc-nte/SetDataTable_TGS2001.rel differ
diff --git a/system/maps/gc-nte/map_labo00_00e_c1.dat b/system/maps/gc-nte/map_labo00_00e_c1.dat
new file mode 120000
index 00000000..ad77e260
--- /dev/null
+++ b/system/maps/gc-nte/map_labo00_00e_c1.dat
@@ -0,0 +1 @@
+map_labo00_00e.dat
\ No newline at end of file
diff --git a/system/maps/gc-nte/map_labo00_00e_d.dat b/system/maps/gc-nte/map_labo00_00e_d.dat
new file mode 120000
index 00000000..ad77e260
--- /dev/null
+++ b/system/maps/gc-nte/map_labo00_00e_d.dat
@@ -0,0 +1 @@
+map_labo00_00e.dat
\ No newline at end of file
diff --git a/system/maps/gc-nte/map_labo00_00o_c1.dat b/system/maps/gc-nte/map_labo00_00o_c1.dat
new file mode 120000
index 00000000..95f62883
--- /dev/null
+++ b/system/maps/gc-nte/map_labo00_00o_c1.dat
@@ -0,0 +1 @@
+map_labo00_00o.dat
\ No newline at end of file
diff --git a/system/maps/gc-nte/map_labo00_00o_d.dat b/system/maps/gc-nte/map_labo00_00o_d.dat
new file mode 120000
index 00000000..95f62883
--- /dev/null
+++ b/system/maps/gc-nte/map_labo00_00o_d.dat
@@ -0,0 +1 @@
+map_labo00_00o.dat
\ No newline at end of file
diff --git a/system/maps/gc-nte/map_seabed01_00_00e.dat b/system/maps/gc-nte/map_seabed01_00_00e.dat
index 8339418e..24630889 100644
Binary files a/system/maps/gc-nte/map_seabed01_00_00e.dat and b/system/maps/gc-nte/map_seabed01_00_00e.dat differ
diff --git a/system/maps/gc-nte/map_seabed01_01_00e.dat b/system/maps/gc-nte/map_seabed01_01_00e.dat
index 8339418e..24630889 100644
Binary files a/system/maps/gc-nte/map_seabed01_01_00e.dat and b/system/maps/gc-nte/map_seabed01_01_00e.dat differ
diff --git a/system/maps/gc-v3/SetDataTableOff.rel b/system/maps/gc-v3/SetDataTableOff.rel
new file mode 100755
index 00000000..e06c7a1f
Binary files /dev/null and b/system/maps/gc-v3/SetDataTableOff.rel differ
diff --git a/system/maps/gc-v3/SetDataTableOffUlti.rel b/system/maps/gc-v3/SetDataTableOffUlti.rel
new file mode 100755
index 00000000..860f47ab
Binary files /dev/null and b/system/maps/gc-v3/SetDataTableOffUlti.rel differ
diff --git a/system/maps/gc-v3/SetDataTableOn.rel b/system/maps/gc-v3/SetDataTableOn.rel
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