 | Hangly-Man (set 3) (clone of: puckman) | 1981 | hack | hangly3 | Maze | 0.00 |
| | HyperBall (L-4) | 1981 | Williams | hypbl_l4 | | 0.00 |
| | Imola Grand Prix | 1981 | Alberici | imolagp | | 0.00 |
| | Iron Maiden | 1981 | Stern | ironmaid | | 0.00 |
 | Jump Bug | 1981 | Hoei (Rock-Ola license) | jumpbug | Platform / Run Jump Scrolling | 7.52 |
| Jump Bug (bootleg) (clone of: jumpbug) | 1981 | bootleg | jumpbugb | Platform / Run Jump Scrolling | 0.00 |
| | Jungle Lord (L-2) | 1981 | Williams | jngld_l2 | | 0.00 |
 | Jungler | 1981 | Konami | jungler | Maze / Shooter Small | 9.42 |
| Jungler (Stern Electronics) (clone of: jungler) | 1981 | Konami (Stern Electronics license) | junglers | Maze / Shooter Small | 0.00 |
 | Kaos | 1981 | Game Plan | kaos | Platform / Run Jump | 5.80 |
 | Kick (cocktail) (clone of: kick) | 1981 | Midway | kickc | | 0.00 |
| Kick (upright) | 1981 | Midway | kick | Ball & Paddle | 5.32 |
| Kickman (upright) (clone of: kick) | 1981 | Midway | kickman | | 0.00 |
| | King Derby (1981) | 1981 | Tazmi | kingdrby | | 7.42 |
 | KO Punch | 1981 | Sega | kopunch | Misc. | 0.00 |
 | Korosuke Roller (Japan) (clone of: crush) | 1981 | Alpha Denshi Co. / Kural Electric, Ltd. | korosuke | Maze | 0.00 |
 | Lady Bug | 1981 | Universal | ladybug | Maze | 9.46 |
| Lady Bug (bootleg set 1) (clone of: ladybug) | 1981 | bootleg | ladybugb | Maze | 0.00 |
| Lady Bug (bootleg set 2) (clone of: ladybug) | 1981 | bootleg | ladybgb2 | | 0.00 |
| | Lady Luck (Taito) | 1981 | Taito do Brasil | ladylukt | | 0.00 |
