diff --git a/src/CommandFormats.hh b/src/CommandFormats.hh
index a92fc8c9..01cd2f64 100644
--- a/src/CommandFormats.hh
+++ b/src/CommandFormats.hh
@@ -1621,9 +1621,9 @@ struct S_RankUpdate_GC_Ep3_B7 {
 // B8 (S->C): Update card definitions (Episode 3)
 // Contents is a single little-endian le_uint32_t specifying the size of the
 // (PRS-compressed) data, followed immediately by the data.
-// Note: BB has a handler for B8, but it does nothing - the client ignores B8.
+// Note: PSO BB accepts this command as well, but ignores it.
 
-// B8 (C->S): Confirm updated card definitions
+// B8 (C->S): Confirm updated card definitions (Episode 3)
 // No arguments
 // The client sends this after it receives a B8 from the server.
 
@@ -1633,7 +1633,7 @@ struct S_Unknown_GC_Ep3_B9 {
   le_uint32_t unknown_a1; // Must be 1-4 (inclusive)
   le_uint32_t unknown_a2;
   le_uint16_t unknown_a3;
-  le_uint16_t unknown_a4;
+  le_uint16_t unused;
   parray<uint8_t, 0x3800> unknown_a5;
 };
 
@@ -2708,14 +2708,14 @@ struct G_EnemyHitByPlayer_6x0A {
 // 0F: Invalid subcommand
 // 10: Unknown (not valid on Episode 3)
 // 11: Unknown (not valid on Episode 3)
-// 12: Dragon actions (not valid on Episode 3)
-// 13: Re Rol Le actions (not valid on Episode 3)
+// 12: Dragon boss actions (not valid on Episode 3)
+// 13: Re Rol Le boss actions (not valid on Episode 3)
 // 14: Unknown (supported; game only; not valid on Episode 3)
 // 15: Vol Opt boss actions (not valid on Episode 3)
 // 16: Vol Opt boss actions (not valid on Episode 3)
 // 17: Unknown (supported; game only; not valid on Episode 3)
 // 18: Unknown (supported; game only; not valid on Episode 3)
-// 19: Dark Falz actions (not valid on Episode 3)
+// 19: Dark Falz boss actions (not valid on Episode 3)
 // 1A: Invalid subcommand
 // 1B: Unknown (not valid on Episode 3)
 // 1C: Unknown (supported; game only; not valid on Episode 3)
@@ -3096,7 +3096,7 @@ struct G_BoxItemDropRequest_6xA2 {
 // B4: Unknown (Episode 3 only)
 // B5: Episode 3 game setup menu state sync
 // B5: BB shop request (handled by the server)
-// B6: Episode 3 map list (server->client only)
+// B6: Episode 3 subcommands (server->client only)
 
 // B6: BB shop contents (server->client only)
 
diff --git a/src/ReceiveCommands.cc b/src/ReceiveCommands.cc
index 658abc95..6f936944 100644
--- a/src/ReceiveCommands.cc
+++ b/src/ReceiveCommands.cc
@@ -2713,7 +2713,7 @@ static process_command_t gc_handlers[0x100] = {
   // B0
   nullptr, process_server_time_request, nullptr, process_function_call_result,
   nullptr, nullptr, nullptr, process_ignored_command,
-  process_ignored_command, nullptr, process_ep3_meseta_transaction, nullptr,
+  process_ignored_command, process_ignored_command, process_ep3_meseta_transaction, nullptr,
   nullptr, nullptr, nullptr, nullptr,
 
   // C0
diff --git a/src/SendCommands.cc b/src/SendCommands.cc
index d575b65d..12d1d0ab 100644
--- a/src/SendCommands.cc
+++ b/src/SendCommands.cc
@@ -1450,7 +1450,7 @@ void send_ep3_map_list(shared_ptr<ServerState> s, shared_ptr<Lobby> l) {
   string cmd_data(16, '\0');
   PSOSubcommand* subs = reinterpret_cast<PSOSubcommand*>(cmd_data.data());
   subs[0].dword = 0x000000B6;
-  subs[1].dword = (data.size() + 0x14 + 3) & 0xFFFFFFFC;
+  subs[1].dword = (data.size() + 0x10 + 3) & 0xFFFFFFFC;
   subs[2].dword = 0x00000040;
   subs[3].dword = data.size();
   cmd_data += data;
@@ -1466,7 +1466,7 @@ void send_ep3_map_data(shared_ptr<ServerState> s, shared_ptr<Lobby> l, uint32_t
   string data(0x14, '\0');
   PSOSubcommand* subs = reinterpret_cast<PSOSubcommand*>(data.data());
   subs[0].dword = 0x000000B6;
-  subs[1].dword = (19 + compressed.size()) & 0xFFFFFFFC;
+  subs[1].dword = (compressed.size() + 0x14 + 3) & 0xFFFFFFFC;
   subs[2].dword = 0x00000041;
   subs[3].dword = entry->map.map_number.load();
   subs[4].dword = compressed.size();
diff --git a/tests/GC-Episode3GameSmokeTest.test.txt b/tests/GC-Episode3GameSmokeTest.test.txt
index 479271b8..c7ec03b9 100644
--- a/tests/GC-Episode3GameSmokeTest.test.txt
+++ b/tests/GC-Episode3GameSmokeTest.test.txt
@@ -3672,7 +3672,7 @@ I 94711 2022-07-26 00:26:28 - [Commands] Received from C-8 (NO DATA) (version=GC
 0000000000000010 | 00 00 00 00                                     |                 
 I 94711 2022-07-26 00:26:28 - [StaticGameData] Generated Episode 3 compressed map list (12120 -> 3105 bytes)
 I 94711 2022-07-26 00:26:28 - [Commands] Sending to C-8 (NO DATA) (version=GC command=6C flag=00)
-0000000000000000 | 6C 00 38 0C B6 00 00 00 38 0C 00 00 40 00 00 00 | l 8     8   @   
+0000000000000000 | 6C 00 38 0C B6 00 00 00 34 0C 00 00 40 00 00 00 | l 8     8   @   
 0000000000000010 | 21 0C 00 00 00 00 2F 58 8F 00 00 00 0E FC F8 F9 | !     /X        
 0000000000000020 | 1D C0 00 00 FF 2F 58 01 B1 00 6F 00 00 3B 02 30 |      /X   o  ; 0
 0000000000000030 | 64 FF 00 0D C6 FC 1A FC 27 AF 00 07 00 07 65 FF | d       '     e 
@@ -3887,7 +3887,7 @@ I 94711 2022-07-26 00:26:37 - [Commands] Received from C-8 (NO DATA) (version=GC
 0000000000000000 | CA 00 18 00 B3 05 E0 E1 41 00 00 10 FF FF FF FF |         A       
 0000000000000010 | 00 00 00 00 58 02 00 00                         |     X           
 I 94711 2022-07-26 00:26:37 - [Commands] Sending to C-8 (NO DATA) (version=GC command=6C flag=00)
-0000000000000000 | 6C 00 84 04 B6 00 00 00 7C 04 00 00 41 00 00 00 | l       |   A   
+0000000000000000 | 6C 00 84 04 B6 00 00 00 80 04 00 00 41 00 00 00 | l       |   A   
 0000000000000010 | 58 02 00 00 69 04 00 00 FF 00 00 01 00 00 00 02 | X   i           
 0000000000000020 | 58 8F 05 08 05 05 F7 C8 F4 FA DE CC FF 04 02 03 | X               
 0000000000000030 | 80 FF 0C 01 49 01 D3 80 FF 0E BD 00 FF 1E 80 FF |     I