| | X Five Jokers (Version 1.12) | 200 | Electronic Projects | x5jokers | | 0.00 |
 | X Multiply (Japan, M72) (clone of: xmultipl) | 1989 | Irem | xmultiplm72 | | 0.00 |
| X Multiply (World, M81) | 1989 | Irem | xmultipl | Shooter / Flying Horizontal | 8.75 |
| | X Se Dae Quiz | 1995 | Dream Island | xsedae | | 0.00 |
| | X the Ball | 1991 | Rare | xtheball | | 0.00 |
 | X-Day 2 (Japan) | 1995 | Namco | xday2 | Unplayable | 1.50 |
 | X-Files | 1999 | dgPIX Entertainment Inc. | xfiles | Unplayable | 4.67 |
 | X-Men (2 Players ver AAA) (clone of: xmen) | 1992 | Konami | xmen2pa | | 0.00 |
| X-Men (2 Players ver EAA) (clone of: xmen) | 1992 | Konami | xmen2pe | | 0.00 |
| X-Men (2 Players ver JAA) (clone of: xmen) | 1992 | Konami | xmen2pj | Fighter / 2.5D | 0.00 |
| X-Men (4 Players ver EBA) (clone of: xmen) | 1992 | Konami | xmene | | 0.00 |
| X-Men (4 Players ver JBA) (clone of: xmen) | 1992 | Konami | xmenj | | 0.00 |
| X-Men (4 Players ver UBB) | 1992 | Konami | xmen | Fighter / 2.5D | 8.97 |
| X-Men (6 Players ver ECB) (clone of: xmen) | 1992 | Konami | xmen6p | Fighter / 2.5D | 10.00 |
| X-Men (6 Players ver UCB) (clone of: xmen) | 1992 | Konami | xmen6pu | | 0.00 |
 | X-Men Vs. Street Fighter (Asia 960910) (clone of: xmvsf) | 1996 | Capcom | xmvsfar2 | | 0.00 |
| X-Men Vs. Street Fighter (Asia 960919) (clone of: xmvsf) | 1996 | Capcom | xmvsfar1 | | 0.00 |
| X-Men Vs. Street Fighter (Asia 961023) (clone of: xmvsf) | 1996 | Capcom | xmvsfa | Fighter / Versus | 0.00 |
| X-Men Vs. Street Fighter (Brazil 961023) (clone of: xmvsf) | 1996 | Capcom | xmvsfb | Fighter / Versus | 0.00 |
| X-Men Vs. Street Fighter (Euro 960910) (clone of: xmvsf) | 1996 | Capcom | xmvsfr1 | | 0.00 |
