diff --git a/src/drivers/libretro/libretro.c b/src/drivers/libretro/libretro.c
index 18f8159..ab761f9 100644
--- a/src/drivers/libretro/libretro.c
+++ b/src/drivers/libretro/libretro.c
@@ -832,11 +832,272 @@ input_cheat:
    FCEUI_AddCheat(name, a, v, c, type);
 }
 
+typedef struct cartridge_db
+{
+   char title[256];
+   uint32_t crc;
+} cartridge_db_t;
+
+static const struct cartridge_db fourscore_db_list[] = 
+{
+   {
+      "Bomberman II (USA)",
+      0x1ebb5b42
+   },
+#if 0
+   {
+      "Championship Bowling (USA)",
+      0xeac38105
+   },
+#endif
+   {
+      "Chris Evert & Ivan Lendl in Top Players' Tennis (USA)",
+      0xf99e37eb
+   },
+#if 0
+   { 
+      "Crash 'n' the Boys - Street Challenge (USA)",
+      0xc7f0c457
+   },
+#endif
+   {
+      "Four Players' Tennis (Europe)",
+      0x48b8ee58 
+   },
+   { 
+      "Danny Sullivan's Indy Heat (Europe)",
+      0x27ca0679,
+   },
+   {
+      "Gauntlet II (Europe)",
+      0x79f688bc
+   },
+   {
+      "Gauntlet II (USA)",
+      0x1b71ccdb
+   },
+   {
+      "Greg Norman's Golf Power (USA)",
+      0x1352f1b9
+   },
+   {
+      "Harlem Globetrotters (USA)",
+      0x2e6ee98d
+   },
+   {
+      "Ivan 'Ironman' Stewart's Super Off Road (Europe)",
+      0x05104517
+   },
+   {
+      "Ivan 'Ironman' Stewart's Super Off Road (USA)",
+      0x4b041b6b
+   },
+   {
+      "Kings of the Beach - Professional Beach Volleyball (USA)",
+      0xf54b34bd
+   },
+   {
+      "Magic Johnson's Fast Break (USA)",
+      0xc6c2edb5
+   },
+   {
+      "M.U.L.E. (USA)",
+      0x0939852f
+   },
+   {
+      "Monster Truck Rally (USA)",
+      0x2f698c4d
+   },
+   {
+      "NES Play Action Football (USA)",
+      0xb9b4d9e0
+   },
+   {
+      "Nightmare on Elm Street, A (USA)",
+      0xda2cb59a
+   },
+   {
+      "Nintendo World Cup (Europe)",
+      0x8da6667d
+   },
+   {
+      "Nintendo World Cup (Europe) (Rev A)",
+      0x7c16f819
+   },
+   {
+      "Nintendo World Cup (Europe) (Rev B)",
+      0x7f08d0d9
+   },
+   {
+      "Nintendo World Cup (USA)",
+      0xa22657fa
+   },
+   {
+      "R.C. Pro-Am II (Europe)",
+      0x308da987
+   },
+   {
+      "R.C. Pro-Am II (USA)",
+      0x9edd2159
+   },
+   {
+      "Rackets & Rivals (Europe)",
+      0x8fa6e92c
+   },
+   {
+      "Roundball - 2-on-2 Challenge (Europe)",
+      0xad0394f0
+   },
+   {
+      "Roundball - 2-on-2 Challenge (USA)",
+      0x6e4dcfd2
+   },
+   {
+      "Spot - The Video Game (Japan)",
+      0x0abdd5ca
+   },
+   {
+      "Spot - The Video Game (USA)",
+      0xcfae9dfa
+   },
+   {
+      "Smash T.V. (Europe)",
+      0x0b8f8128
+   },
+   {
+      "Smash T.V. (USA)",
+      0x6ee94d32
+   },
+   {
+      "Super Jeopardy! (USA)",
+      0xcf4487a2
+   },
+   {
+      "Super Spike V'Ball (Europe)",
+      0xc05a63b2
+   },
+   {
+      "Super Spike V'Ball (USA)",
+      0xe840fd21
+   },
+   {
+      "Super Spike V'Ball + Nintendo World Cup (USA)",
+      0x407d6ffd
+   },
+   {
+      "Swords and Serpents (Europe)",
+      0xd153caf6
+   },
+   {
+      "Swords and Serpents (France)",
+      0x46135141
+   },
+   {
+      "Swords and Serpents (USA)",
+      0x3417ec46
+   },
+   {
+      "Battle City (Japan) (4 Players Hack) http://www.romhacking.net/hacks/2142/",
+      0x69977c9e
+   },
+   {
+      "Bomberman 3 (Homebrew) http://tempect.de/senil/games.html",
+      0x2da5ece0
+   },
+   {
+      "K.Y.F.F. (Homebrew) http://slydogstudios.org/index.php/k-y-f-f/",
+      0x90d2e9f0
+   },
+   {
+      "Super PakPak (Homebrew) http://wiki.nesdev.com/w/index.php/Super_PakPak",
+      0x1394ded0
+   },
+   {
+      "Super Mario Bros. + Tetris + Nintendo World Cup (Europe)",
+      0x73298c87
+   },
+   {
+      "Super Mario Bros. + Tetris + Nintendo World Cup (Europe) (Rev A)",
+      0xf46ef39a
+   }
+};
+
+static const struct cartridge_db famicom_4p_db_list[] = 
+{
+   {
+      "Bakutoushi Patton-Kun (Japan) (FDS)",
+      0xc39b3bb2
+   },
+   {
+      "Bomber Man II (Japan)",
+      0x0c401790
+   },
+   {
+      "Championship Bowling (Japan)",
+      0x9992f445
+   },
+   {
+      "Downtown - Nekketsu Koushinkyoku - Soreyuke Daiundoukai (Japan)",
+      0x3e470fe0
+   },
+   {
+      "Ike Ike! Nekketsu Hockey-bu - Subette Koronde Dairantou (Japan)",
+      0x4f032933
+   },
+   {
+      "Kunio-kun no Nekketsu Soccer League (Japan)",
+      0x4b5177e9
+   },
+   {
+      "Moero TwinBee - Cinnamon Hakase o Sukue! (Japan)",
+      0x9f03b11f
+   },
+   {
+      "Moero TwinBee - Cinnamon Hakase wo Sukue! (Japan) (FDS)",
+      0x13205221
+   },
+   {
+      "Nekketsu Kakutou Densetsu (Japan)",
+      0x37e24797
+   },
+   {
+      "Nekketsu Koukou Dodgeball-bu (Japan)",
+      0x62c67984
+   },
+   {
+      "Nekketsu! Street Basket - Ganbare Dunk Heroes (Japan)",
+      0x88062d9a
+   },
+   {
+      "Super Dodge Ball (USA) (3-4p with Game Genie code GEUOLZZA)",
+      0x689971f9
+   },
+   {
+      "Super Dodge Ball (USA) (patched) http://www.romhacking.net/hacks/71/",
+      0x4ff17864
+   },
+   {
+      "U.S. Championship V'Ball (Japan)",
+      0x213cb3fb
+   },
+   {
+      "U.S. Championship V'Ball (Japan) (Beta)",
+      0xd7077d96
+   },
+   {
+      "Wit's (Japan)",
+      0xb1b16b8a
+   }
+};
+
 extern uint32_t iNESGameCRC32;
 
 bool retro_load_game(const struct retro_game_info *game)
 {
+   unsigned i;
    char* dir=NULL;
+   size_t fourscore_len = sizeof(fourscore_db_list)   / sizeof(fourscore_db_list[0]);
+   size_t famicom_4p_len = sizeof(famicom_4p_db_list) / sizeof(famicom_4p_db_list[0]);
 
    struct retro_input_descriptor desc[] = {
       { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT,  "D-Pad Left" },
@@ -903,6 +1164,26 @@ bool retro_load_game(const struct retro_game_info *game)
    if (!environ_cb(RETRO_ENVIRONMENT_GET_OVERSCAN, &use_overscan))
       use_overscan = true;
 
+   FCEUI_DisableFourScore(1);
+
+   for (i = 0; i < fourscore_len; i++)
+   {
+      if (fourscore_db_list[i].crc == iNESGameCRC32)
+      {
+         FCEUI_DisableFourScore(0);
+         break;
+      }
+   }
+
+   for (i = 0; i < famicom_4p_len; i++)
+   {
+      if (famicom_4p_db_list[i].crc == iNESGameCRC32)
+      {
+         FCEUI_SetInputFC(SIFC_4PLAYER, &JSReturn[0], 0);
+         break;
+      }
+   }
+
    return true;
 }