 | Red Alert | 1981 | Irem (GDI license) | redalert | Shooter / Gallery | 4.33 |
 | Red Clash (Kaneko) (clone of: redclash) | 1981 | Tehkan (Kaneko license) | redclashk | | 0.00 |
| Red Clash (set 1) | 1981 | Tehkan | redclash | Shooter / Flying Vertical | 7.48 |
| Red Clash (set 2) (clone of: redclash) | 1981 | Tehkan | redclasha | | 0.00 |
 | River Patrol (bootleg) (clone of: rpatrol) | 1981 | bootleg | rpatrolb | Driving / Boat | 10.00 |
| | River Patrol (Orca) | 1981 | Orca | rpatrol | | 7.00 |
 | Robby Roto | 1981 | Bally Midway | robby | Maze / Digging | 8.41 |
 | Rock Climber | 1981 | Taito | rockclim | Climbing | 3.50 |
 | Round-Up | 1981 | Taito Corporation (Amenip/Centuri license) | roundup | Maze | 6.00 |
 | Route 16 (bootleg) (clone of: route16) | 1981 | bootleg | route16b | Maze | 0.00 |
| Route 16 (set 1) | 1981 | Tehkan / Sun Electronics (Centuri license) | route16 | Maze | 6.00 |
| Route 16 (set 2) (clone of: route16) | 1981 | Tehkan / Sun Electronics (Centuri license) | route16a | Maze | 0.00 |
| Route X (bootleg) (clone of: route16) | 1981 | bootleg | routex | Maze | 0.00 |
| | Royal Mahjong (Japan, v1.13) | 1981 | Nichibutsu | royalmj | | 0.00 |
 | Satan of Saturn (set 1) (sample of: vanguard) | 1981 | SNK | satansat | Shooter / Gallery | 9.26 |
| Satan of Saturn (set 2) (clone of: satansat) (sample of: vanguard) | 1981 | SNK | satansata | | 0.00 |
 | Satan's Hollow (set 1) | 1981 | Bally Midway | shollow | Shooter / Gallery | 7.36 |
| Satan's Hollow (set 2) (clone of: shollow) | 1981 | Bally Midway | shollow2 | Shooter / Gallery | 0.00 |
 | Savanna (Jungler bootleg) (clone of: jungler) | 1981 | bootleg (Olympia) | savanna | | 0.00 |
 | Scramble | 1981 | Konami | scramble | Shooter / Flying Horizontal | 8.59 |
