diff --git a/README.md b/README.md
index ebe59b27..006bf50e 100644
--- a/README.md
+++ b/README.md
@@ -294,6 +294,7 @@ Some commands only work on the game server and not on the proxy server. The chat
         * You'll see in-game messages from the server when you take certain actions, like killing an enemy in BB.
         * You'll see the rare seed value and floor variations when you join a game.
         * You'll be placed into the highest available slot in lobbies and games instead of the lowest, unless you're joining a BB solo-mode game.
+        * You'll be able to join games with any PSO version, not only those for which crossplay is normally supported. Be prepared for client crashes and other client-side brokenness if you do this. Please do not submit any issues for broken behaviors in crossplay, unless the situation is explicitly supported (see the "Cross-version play" section above).
         * The rest of the commands in this section are enabled on the game server. (They are always enabled on the proxy server.)
     * `$quest <number>` (game server only): Load a quest by quest number. Can be used to load battle or challenge quests with only one player present.
     * `$qcall <function-id>`: Call a quest function on your client.
diff --git a/src/ReceiveCommands.cc b/src/ReceiveCommands.cc
index 5dab9574..92d7719c 100644
--- a/src/ReceiveCommands.cc
+++ b/src/ReceiveCommands.cc
@@ -1831,32 +1831,68 @@ static void on_09(shared_ptr<Client> c, uint16_t, uint32_t, string& data) {
             abbreviation_for_episode(game->episode),
             abbreviation_for_difficulty(game->difficulty),
             abbreviation_for_mode(game->mode),
-            name_for_section_id(game->section_id));
+            abbreviation_for_section_id(game->section_id));
 
-        bool cheats_enabled = game->check_flag(Lobby::Flag::CHEATS_ENABLED);
-        bool locked = !game->password.empty();
-        if (cheats_enabled && locked) {
-          info += "$C4Locked$C7, $C6cheats on$C7\n";
-        } else if (cheats_enabled) {
-          info += "$C6Cheats on$C7\n";
-        } else if (locked) {
-          info += "$C4Locked$C7\n";
-        }
+        if (c->config.check_flag(Client::Flag::DEBUG_ENABLED)) {
+          vector<const char*> flags_tokens;
+          string quest_name;
+          if (game->check_flag(Lobby::Flag::CHEATS_ENABLED)) {
+            flags_tokens.emplace_back("$C6C$C7");
+          }
+          if (game->check_flag(Lobby::Flag::PERSISTENT)) {
+            flags_tokens.emplace_back("$C6P$C7");
+          }
+          if (!game->password.empty()) {
+            flags_tokens.emplace_back("$C4L$C7");
+          }
+          if (game->check_flag(Lobby::Flag::IS_SPECTATOR_TEAM)) {
+            flags_tokens.emplace_back("$C8ST$C7");
+          }
+          if (game->check_flag(Lobby::Flag::SPECTATORS_FORBIDDEN)) {
+            flags_tokens.emplace_back("$C8NS$C7");
+          }
+          if (game->quest) {
+            flags_tokens.emplace_back(game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS) ? "$C3JQ$C7" : "$C3Q$C7");
+            quest_name = remove_color(game->quest->name);
+          } else if (game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS)) {
+            flags_tokens.emplace_back("$C3JQ$C7");
+          } else if (game->check_flag(Lobby::Flag::QUEST_IN_PROGRESS)) {
+            flags_tokens.emplace_back("$C3Q$C7");
+          } else if (game->check_flag(Lobby::Flag::BATTLE_IN_PROGRESS)) {
+            flags_tokens.emplace_back("$C3B$C7");
+          }
+          info += ("Flags: " + join(flags_tokens, ",") + "\n");
+          if (!quest_name.empty()) {
+            info += ("Q: $C6" + quest_name + "$C7\n");
+          }
+          info += string_printf("Version: %s\n", name_for_enum(game->base_version));
 
-        if (game->quest) {
-          info += (game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS)) ? "$C6Quest: " : "$C4Quest: ";
-          info += remove_color(game->quest->name);
-          info += "\n";
-        } else if (game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS)) {
-          info += "$C6Quest in progress\n";
-        } else if (game->check_flag(Lobby::Flag::QUEST_IN_PROGRESS)) {
-          info += "$C4Quest in progress\n";
-        } else if (game->check_flag(Lobby::Flag::BATTLE_IN_PROGRESS)) {
-          info += "$C4Battle in progress\n";
-        }
+        } else {
+          bool cheats_enabled = game->check_flag(Lobby::Flag::CHEATS_ENABLED);
+          bool locked = !game->password.empty();
+          if (cheats_enabled && locked) {
+            info += "$C4Locked$C7, $C6cheats on$C7\n";
+          } else if (cheats_enabled) {
+            info += "$C6Cheats on$C7\n";
+          } else if (locked) {
+            info += "$C4Locked$C7\n";
+          }
 
-        if (game->check_flag(Lobby::Flag::SPECTATORS_FORBIDDEN)) {
-          info += "$C4View Battle forbidden\n";
+          if (game->quest) {
+            info += (game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS)) ? "$C6Quest: " : "$C4Quest: ";
+            info += remove_color(game->quest->name);
+            info += "\n";
+          } else if (game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS)) {
+            info += "$C6Quest in progress\n";
+          } else if (game->check_flag(Lobby::Flag::QUEST_IN_PROGRESS)) {
+            info += "$C4Quest in progress\n";
+          } else if (game->check_flag(Lobby::Flag::BATTLE_IN_PROGRESS)) {
+            info += "$C4Battle in progress\n";
+          }
+
+          if (game->check_flag(Lobby::Flag::SPECTATORS_FORBIDDEN)) {
+            info += "$C4View Battle forbidden\n";
+          }
         }
 
         strip_trailing_whitespace(info);
@@ -2349,7 +2385,7 @@ static void on_10(shared_ptr<Client> c, uint16_t, uint32_t, string& data) {
         send_lobby_message_box(c, "$C6You cannot join this\ngame because it is\nfull.");
         break;
       }
-      if (!game->version_is_allowed(c->version())) {
+      if (!game->version_is_allowed(c->version()) && !c->config.check_flag(Client::Flag::DEBUG_ENABLED)) {
         send_lobby_message_box(c, "$C6You cannot join this\ngame because it is\nfor a different\nversion of PSO.");
         break;
       }
diff --git a/src/ReceiveSubcommands.cc b/src/ReceiveSubcommands.cc
index d11c1b8b..6920da8d 100644
--- a/src/ReceiveSubcommands.cc
+++ b/src/ReceiveSubcommands.cc
@@ -530,6 +530,7 @@ static void on_sync_joining_player_disp_and_inventory(
           out_cmd.num_items = xb_cmd->num_items;
           out_cmd.items = xb_cmd->items;
         } else if (bb_cmd) {
+          out_cmd.base.visual.name.encode(bb_cmd->name.decode(c->language()), target->language());
           out_cmd.stats = bb_cmd->stats;
           out_cmd.num_items = bb_cmd->num_items;
           out_cmd.items = bb_cmd->items;
@@ -562,6 +563,7 @@ static void on_sync_joining_player_disp_and_inventory(
           out_cmd.items = xb_cmd->items;
           out_cmd.floor = xb_cmd->floor;
         } else if (bb_cmd) {
+          out_cmd.base.visual.name.encode(bb_cmd->name.decode(c->language()), target->language());
           out_cmd.stats = bb_cmd->stats;
           out_cmd.num_items = bb_cmd->num_items;
           out_cmd.items = bb_cmd->items;
@@ -597,6 +599,7 @@ static void on_sync_joining_player_disp_and_inventory(
           out_cmd.items = gc_cmd->items;
           out_cmd.floor = gc_cmd->floor;
         } else if (bb_cmd) {
+          out_cmd.base.visual.name.encode(bb_cmd->name.decode(c->language()), target->language());
           out_cmd.stats = bb_cmd->stats;
           out_cmd.num_items = bb_cmd->num_items;
           out_cmd.items = bb_cmd->items;
@@ -616,6 +619,7 @@ static void on_sync_joining_player_disp_and_inventory(
       } else {
         G_SyncPlayerDispAndInventory_BB_6x70 out_cmd;
         out_cmd.base = *base;
+        out_cmd.base.visual.name.encode(string_printf("%10" PRIu32, c->license->serial_number), target->language());
         out_cmd.name.encode(base->visual.name.decode(c->language()), target->language());
         if (v2_cmd) {
           out_cmd.stats = v2_cmd->stats;
diff --git a/src/SendCommands.cc b/src/SendCommands.cc
index abc19729..1bcf1438 100644
--- a/src/SendCommands.cc
+++ b/src/SendCommands.cc
@@ -1354,9 +1354,10 @@ void send_game_menu_t(
   }
 
   set<shared_ptr<const Lobby>, bool (*)(const shared_ptr<const Lobby>&, const shared_ptr<const Lobby>&)> games(Lobby::compare_shared);
+  bool client_has_debug = c->config.check_flag(Client::Flag::DEBUG_ENABLED);
   for (shared_ptr<Lobby> l : s->all_lobbies()) {
     if (l->is_game() &&
-        l->version_is_allowed(c->version()) &&
+        (client_has_debug || l->version_is_allowed(c->version())) &&
         (l->check_flag(Lobby::Flag::IS_SPECTATOR_TEAM) == is_spectator_team_list) &&
         (!show_tournaments_only || l->tournament_match)) {
       games.emplace(l);
@@ -2667,14 +2668,15 @@ void send_give_experience(shared_ptr<Client> c, uint32_t amount) {
 }
 
 void send_set_exp_multiplier(shared_ptr<Lobby> l) {
-  if (l->base_version != Version::BB_V4) {
-    throw logic_error("6xDD can only be sent to BB clients");
-  }
   if (!l->is_game()) {
     throw logic_error("6xDD can only be sent in games (not in lobbies)");
   }
   G_SetEXPMultiplier_BB_6xDD cmd = {{0xDD, sizeof(G_SetEXPMultiplier_BB_6xDD) / 4, (l->mode == GameMode::CHALLENGE) ? 1 : l->base_exp_multiplier}};
-  send_command_t(l, 0x60, 0x00, cmd);
+  for (auto lc : l->clients) {
+    if (lc && (lc->version() == Version::BB_V4)) {
+      send_command_t(l, 0x60, 0x00, cmd);
+    }
+  }
 }
 
 void send_rare_enemy_index_list(shared_ptr<Client> c, const vector<size_t>& indexes) {
diff --git a/src/StaticGameData.cc b/src/StaticGameData.cc
index 2b8fe7f3..e0895e2e 100644
--- a/src/StaticGameData.cc
+++ b/src/StaticGameData.cc
@@ -109,6 +109,9 @@ static const array<const char*, 10> section_id_to_name = {
     "Viridia", "Greennill", "Skyly", "Bluefull", "Purplenum",
     "Pinkal", "Redria", "Oran", "Yellowboze", "Whitill"};
 
+static const array<const char*, 10> section_id_to_abbreviation = {
+    "Vir", "Grn", "Sky", "Blu", "Prp", "Pnk", "Red", "Orn", "Ylw", "Wht"};
+
 const unordered_map<string, uint8_t> name_to_section_id({
     {"viridia", 0},
     {"greennill", 1},
@@ -221,6 +224,14 @@ const vector<string> npc_id_to_name({"ninja", "rico", "sonic", "knuckles", "tail
 const unordered_map<string, uint8_t> name_to_npc_id = {
     {"ninja", 0}, {"rico", 1}, {"sonic", 2}, {"knuckles", 3}, {"tails", 4}, {"flowen", 5}, {"elly", 6}};
 
+const char* abbreviation_for_section_id(uint8_t section_id) {
+  if (section_id < section_id_to_abbreviation.size()) {
+    return section_id_to_abbreviation[section_id];
+  } else {
+    return "<Unknown>";
+  }
+}
+
 const char* name_for_section_id(uint8_t section_id) {
   if (section_id < section_id_to_name.size()) {
     return section_id_to_name[section_id];
diff --git a/src/StaticGameData.hh b/src/StaticGameData.hh
index 5181e6c9..87861eaf 100644
--- a/src/StaticGameData.hh
+++ b/src/StaticGameData.hh
@@ -40,6 +40,7 @@ extern const std::unordered_map<std::string, uint8_t> name_to_tech_id;
 const std::string& name_for_technique(uint8_t tech);
 uint8_t technique_for_name(const std::string& name);
 
+const char* abbreviation_for_section_id(uint8_t section_id);
 const char* name_for_section_id(uint8_t section_id);
 uint8_t section_id_for_name(const std::string& name);