| MAME Name | Description | Official | Alternate | VC WS | ||
 | xenophob | Xenophobe | 317 kB 06-Aug-2022 Download | - | 254 kB 06-Aug-2022 Download | |
 | xevi3dg | Xevious 3D/G (World, XV32/VER.B) | - | - | 181 kB 06-Aug-2022 Download | |
 | xevios | Xevios | 1.20 MB 06-Aug-2022 Download | - | - | |
 | xevious | Xevious (Namco) | 17.8 MB 06-Aug-2022 Download | - | 819 kB 06-Aug-2022 Download | |
 | xeviousb | Xevious (Atari) | - | - | 832 kB 06-Aug-2022 Download | |
| xexex | Xexex (ver EAA) | - | - | 140 kB 06-Aug-2022 Download | |
 | xmcota | X-Men: Children of the Atom (Euro 950331) | 2.44 MB 06-Aug-2022 Download | - | 819 kB 06-Aug-2022 Download | |
 | xmen | X-Men (4 Players ver EBA) | - | - | 382 kB 06-Aug-2022 Download | |
| xmen2pe | X-Men (2 Players ver EAA) | - | - | 160 kB 06-Aug-2022 Download | |
 | xmen6p | X-Men (6 Players ver ECB) | 1.09 MB 06-Aug-2022 Download | - | - | |
 | xmen6pu | X-Men (6 Players ver UCB) | 1.09 MB 06-Aug-2022 Download | - | - | |
| xmultipl | X Multiply (World, M81 hardware) | - | - | 208 kB 06-Aug-2022 Download | |
 | xmvsf | X-Men Vs. Street Fighter (Euro 961004) | 3.30 MB 06-Aug-2022 Download | - | 274 kB 06-Aug-2022 Download | |
| xorworld | Xor World (prototype) | - | - | 51.5 kB 06-Aug-2022 Download | |
 | xsleena | Xain'd Sleena (World) | 18.2 MB 06-Aug-2022 Download | - | 189 kB 06-Aug-2022 Download | |
| xtheball | X the Ball | - | - | 258 kB 06-Aug-2022 Download | |
 | xxmissio | XX Mission | 1.48 MB 06-Aug-2022 Download | - | 416 kB 06-Aug-2022 Download | |
 | xybots | Xybots (rev 2) | 755 kB 06-Aug-2022 Download | - | 130 kB 06-Aug-2022 Download | |
| xyonix | Xyonix | - | - | 89.1 kB 06-Aug-2022 Download | |
