 | Muscle Bomber: The Body Explosion (Japan 930713) (clone of: slammast) | 1993 | Capcom | mbomberj | Wrestling | 0.00 |
| | Mushiking The King Of Beetle 2K3 2nd | 2003 | Sega | mtkob2 | | 0.00 |
| | Mushroom Magic (Russia) (Atronic) | 2002 | Atronic | mushmagi | | 0.00 |
| | Music Sort (ver 2.02, English) | 1995 | ABM Games | musicsrt | | 0.00 |
 | Musoubana (Japan) | 1995 | Nichibutsu / Yubis | musobana | Tabletop / Hanafuda *Mature* | 0.00 |
 | Mustache Boy | 1987 | Seibu Kaihatsu (March license) | mustache | Maze | 1.70 |
 | Mustafa and 40 Thieves (bootleg) (clone of: alibaba) | 1982 | bootleg | alibabab | | 0.00 |
 | Mutant Fighter (World ver EM-3) (clone of: mutantf) | 1992 | Data East Corporation | mutantf3 | | 0.00 |
| Mutant Fighter (World ver EM-4) (clone of: mutantf) | 1992 | Data East Corporation | mutantf4 | | 0.00 |
| Mutant Fighter (World ver EM-5) | 1992 | Data East Corporation | mutantf | Fighter / Versus | 5.66 |
 | Mutant Night | 1987 | UPL (Kawakus license) | mnight | Platform / Shooter Scrolling | 2.62 |
 | Mutation Nation (NGM-014)(NGH-014) | 1992 | SNK | mutnat | Fighter / 2.5D | 8.61 |
 | MVP (set 1, Japan, FD1094 317-0142) (clone of: mvp) | 1989 | Sega | mvpj | Sports / Baseball | 0.00 |
| MVP (set 2, US, FD1094 317-0143) | 1989 | Sega | mvp | Sports / Baseball | 8.30 |
 | MX5000 | 1987 | Konami | mx5000 | Shooter / Flying Vertical | 5.50 |
 | My Hero (Korea) (clone of: myhero) | 1985 | Coreland / Sega | myherok | Fighter / 2D | 0.00 |
| My Hero (US, not encrypted) | 1985 | Coreland / Sega | myhero | Fighter / 2D | 7.65 |
 | Mysterious Stones - Dr. John's Adventure | 1984 | Technos Japan | mystston | Maze / Shooter Large | 4.43 |
| Mysterious Stones - Dr. Kick in Adventure (clone of: mystston) | 1984 | Technos Japan | myststono | | 0.00 |
| | Mystery Castle | 1993 | Alvin G | mystcast | | 0.00 |
