| | X-treme (Bwb) (MPU4) (set 3) (clone of: m4xtrm) | 1969 | Bwb | m4xtrm__b | | 0.00 |
 | Xain'd Sleena | 1986 | Technos Japan | xsleena | Platform / Shooter Scrolling | 5.96 |
| Xain'd Sleena (bootleg) (clone of: xsleena) | 1986 | bootleg | xsleenab | Platform / Shooter Scrolling | 0.00 |
| | Xena Warrior Princess (Bwb) (MPU5) | 1969 | Bwb | m5xena | | 0.00 |
| | Xenon | 1980 | Bally | xenon | | 0.00 |
| | Xenon (Arcadia, V 2.3) | 1988 | Arcadia Systems | ar_xeon | Shooter / Misc. Vertical | 0.00 |
| | Xenon (French) (clone of: xenon) | 1980 | Bally | xenonf | | 0.00 |
 | Xenophobe | 1987 | Bally Midway | xenophob | Platform / Shooter Scrolling | 5.53 |
 | XESS - The New Revolution (SemiCom 3-in-1) | 1997 | SemiCom | 3in1semi | Multiplay | 0.00 |
 | Xevios (clone of: xevious) | 1982 | bootleg | xevios | Shooter / Flying Vertical | 0.00 |
| Xevious (Atari) (clone of: xevious) | 1982 | Namco (Atari license) | xeviousb | Shooter / Flying Vertical | 0.00 |
| Xevious (Atari, harder) (clone of: xevious) | 1982 | Namco (Atari license) | xeviousa | Shooter / Flying Vertical | 0.00 |
| Xevious (Atari, Namco PCB) (clone of: xevious) | 1982 | Namco (Atari license) | xeviousc | Shooter / Flying Vertical | 0.00 |
| Xevious (Namco) | 1982 | Namco | xevious | Shooter / Flying Vertical | 9.51 |
 | Xevious 3D/G (Japan, XV31/VER.A) | 1995 | Namco | xevi3dg | Shooter / Flying Vertical | 7.15 |
 | Xexex (ver AAA) (clone of: xexex) | 1991 | Konami | xexexa | | 0.00 |
| Xexex (ver EAA) | 1991 | Konami | xexex | Shooter / Flying Horizontal | 6.57 |
| Xexex (ver JAA) (clone of: xexex) | 1991 | Konami | xexexj | Shooter / Flying Horizontal | 0.00 |
| | XII Stag (V2.01J) | 2002 | Triangle Service | xiistag | | 7.20 |
 | Xing Yun Man Guan (China, V651C) | 1996 | IGS | xymg | Unplayable | 7.75 |
