| | Sega Touring Car Championship (Unknown Revision) (clone of: stcc) | 1996 | Sega | stccb | | 0.00 |
| | Sega Water Ski (Japan, Revision A) | 1997 | Sega | segawski | | 0.00 |
 | SegaSonic The Hedgehog (Japan, prototype) (clone of: sonic) | 1992 | Sega | sonicp | Platform / Run Jump Scrolling | 0.00 |
| SegaSonic The Hedgehog (Japan, rev. C) | 1992 | Sega | sonic | Platform / Run Jump Scrolling | 7.62 |
 | Sei Senshi Amatelass (clone of: amazon) | 1986 | Nichibutsu | amatelas | Shooter / Walking | 0.00 |
 | Seibu Cup Soccer (set 1) | 1992 | Seibu Kaihatsu | cupsoc | Sports / Soccer | 8.36 |
| Seibu Cup Soccer (set 2) (clone of: cupsoc) | 1992 | Seibu Kaihatsu | cupsoca | | 0.00 |
| Seibu Cup Soccer :Selection: (bootleg, set 1) (clone of: cupsoc) | 1992 | bootleg | cupsocsb | | 0.00 |
| Seibu Cup Soccer :Selection: (bootleg, set 2) (clone of: cupsoc) | 1992 | bootleg | cupsocsb2 | | 0.00 |
| Seibu Cup Soccer :Selection: (set 1) (clone of: cupsoc) | 1992 | Seibu Kaihatsu | cupsocs | | 0.00 |
| Seibu Cup Soccer :Selection: (set 2) (clone of: cupsoc) | 1992 | Seibu Kaihatsu | cupsocs2 | | 0.00 |
 | Seicross | 1984 | Nichibutsu / Alice | seicross | Shooter / Driving Horizontal | 6.63 |
 | Seiha (Japan 870725) | 1987 | Nichibutsu | seiha | Tabletop / Mahjong *Mature* | 10.00 |
| Seiha [BET] (Japan 870723) (clone of: seiha) | 1987 | Nichibutsu | seiham | Tabletop / Mahjong *Mature* | 0.00 |
 | Seimei-Kantei-Meimei-Ki Cult Name | 1996 | I'Max | cultname | Unplayable | 0.00 |
 | Seishun Scandal (315-5132, Japan) (clone of: myhero) | 1985 | Coreland / Sega | sscandal | Fighter / 2D | 0.00 |
 | Sel Feena | 1991 | East Technology | selfeena | Maze | 4.20 |
| | Select (Union) (MPU4) | 1969 | Union | m4select | | 0.00 |
| | Selection (Version 40.02TMB, set 1) | 1982 | Greyhound Electronics | gs4002 | Unplayable | 0.00 |
| | Selection (Version 40.02TMB, set 2) (clone of: gs4002) | 1982 | Greyhound Electronics | gs4002a | | 0.00 |
