 | Jong Tou Ki (Japan) | 1990 | Dynax | jantouki | Tabletop / Mahjong *Mature* | 0.00 |
 | JuJu Densetsu (Playmark bootleg) (clone of: toki) | 1990 | bootleg (Playmark) | jujub | | 0.00 |
 | Kyuukai Douchuuki (Japan new version) | 1990 | Namco | kyukaidk | Sports / Baseball | 0.00 |
| Kyuukai Douchuuki (Japan old version) (clone of: kyukaidk) | 1990 | Namco | kyukaidko | | 0.00 |
| | Kyuukyoku no Othello | 1990 | Success | kothello | Tabletop / Othello | 0.00 |
 | Lady Frog | 1990 | Mondial Games | ladyfrog | Maze | 5.00 |
 | Laser Ghost (US, FD1094 317-0165) (clone of: lghost) | 1990 | Sega | lghostu | Shooter / 1st Person | 0.00 |
| Laser Ghost (World, FD1094 317-0166) | 1990 | Sega | lghost | Shooter / 1st Person | 5.50 |
 | League Bowling (NGM-019)(NGH-019) | 1990 | SNK | lbowling | Sports / Bowling | 8.73 |
 | Lightning Fighters (Asia) (clone of: lgtnfght) | 1990 | Konami | lgtnfghta | | 0.00 |
| Lightning Fighters (US) (clone of: lgtnfght) | 1990 | Konami | lgtnfghtu | | 0.00 |
| Lightning Fighters (World) | 1990 | Konami | lgtnfght | Shooter / Flying Vertical | 6.40 |
 | Liquid Kids (US) (clone of: liquidk) | 1990 | Taito America Corporation | liquidku | Platform / Fighter Scrolling | 0.00 |
| Liquid Kids (World) | 1990 | Taito Corporation Japan | liquidk | Platform / Fighter Scrolling | 7.56 |
| | Lucky Roulette Plus (6-players, Spanish) | 1990 | | luckyrlt | | 0.00 |
| | Mac Attack | 1990 | Mr Game | macattck | | 0.00 |
| | Mad Dog McCree v1C board rev.A (clone of: maddog) | 1990 | American Laser Games | maddoga | | 0.00 |
| | Mad Dog McCree v2.03 board rev.B | 1990 | American Laser Games | maddog | | 7.29 |
 | Magic Sword: Heroic Fantasy (Japan 900623) (clone of: msword) | 1990 | Capcom | mswordj | Platform / Fighter Scrolling | 0.00 |
| Magic Sword: Heroic Fantasy (USA 900725) (clone of: msword) | 1990 | Capcom | mswordu | Platform / Fighter Scrolling | 10.00 |
