 | X Multiply (Japan) | 1989 | Irem | xmultipl | Shooter / Flying Horizontal | 10.00 |
| | X the Ball | 1991 | Rare | xtheball | | 0.00 |
 | X-Day 2 (Japan) | 1995 | Namco | xday2 | Unplayable | 0.00 |
 | X-Files | 1999 | dgPIX Entertainment Inc. | xfiles | Unplayable | 6.00 |
 | X-Men (2 Players ver AAA) (clone of: xmen) | 1992 | Konami | xmen2p | Fighter / 2.5D | 0.00 |
| X-Men (2 Players ver JAA) (clone of: xmen) | 1992 | Konami | xmen2pj | Fighter / 2.5D | 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 | 7.95 |
| 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 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 |
| X-Men Vs. Street Fighter (Euro 961004) | 1996 | Capcom | xmvsf | Fighter / Versus | 9.56 |
| X-Men Vs. Street Fighter (Hispanic 961004) (clone of: xmvsf) | 1996 | Capcom | xmvsfh | Fighter / Versus | 0.00 |
| X-Men Vs. Street Fighter (Japan 960909) (clone of: xmvsf) | 1996 | Capcom | xmvsfjr2 | Fighter / Versus | 0.00 |
| X-Men Vs. Street Fighter (Japan 960910) (clone of: xmvsf) | 1996 | Capcom | xmvsfjr1 | Fighter / Versus | 0.00 |
| X-Men Vs. Street Fighter (Japan 961004) (clone of: xmvsf) | 1996 | Capcom | xmvsfj | Fighter / Versus | 0.00 |
| X-Men Vs. Street Fighter (USA 961004) (clone of: xmvsf) | 1996 | Capcom | xmvsfur1 | Fighter / Versus | 0.00 |
