| X Five Jokers | ? | 200? |
Electronic Projects | Commercial |
| X Multiply | JP | 1989 |
Irem | Commercial |
| X Multiply | WORLD | 1989 |
Irem | Commercial |
| X Se Dae Quiz | KR | 1995 |
Dream Island | Commercial |
| X Tom 3D | ? | 1999-08 |
Andamiro | Commercial |
| X the Ball | ? | 1991 |
Rare | Commercial |
| X-Day 2 | JP | 1995 |
Namco | Commercial |
| X-Men | ? | 1992-02 |
Konami | Commercial |
| X-Men | ? | 1992-02 |
| Unlicensed |
| X-Men Vs. Street Fighter | ? | 2009 |
hack (bankbank) | Unlicensed |
| X-Men Vs. Street Fighter | AS | 1996-09 |
Capcom | Commercial |
| X-Men Vs. Street Fighter | BR | 1996-09 |
Capcom | Commercial |
| X-Men Vs. Street Fighter | EU | 1996-09 |
Capcom | Commercial |
| X-Men Vs. Street Fighter | JP | 1996-09 |
Capcom | Commercial |
| X-Men Vs. Street Fighter | LATAM | 1996-09 |
Capcom | Commercial |
| X-Men Vs. Street Fighter | US | 1996-09 |
Capcom | Commercial |
| X-Men Vs. Street Fighter | US | 1996-09 |
| Unlicensed |
| X-Men: Children of the Atom | AS | 1994-12 |
Capcom | Commercial |
| X-Men: Children of the Atom | BR | 1994-12 |
Capcom | Commercial |
| X-Men: Children of the Atom | EU | 1994-12 |
| Unlicensed |
| X-Men: Children of the Atom | EU | 1994-12 |
Capcom | Commercial |
| X-Men: Children of the Atom | JP | 1994-12 |
Capcom | Commercial |
| X-Men: Children of the Atom | LATAM | 1994-12 |
Capcom | Commercial |
| X-Men: Children of the Atom | US | 1994-12 |
Capcom | Commercial |
| X-Plan | ? | 2006 |
Subsino | Commercial |
| X2222 | ? | 2000 |
Oriental Soft | Prototype |
| X2222 | ? | 2000 |
Oriental Soft | Commercial |
| X628 | ? | 200? |
ControlID | Commercial |
| X80 - War Command | ? | 1981 |
ManilaMatic | Unlicensed |
| XII Stag | ? | 2002 |
Triangle Service | Commercial |
| XX Mission | ? | 1986 |
UPL | Commercial |
| Xain'd Sleena | ? | 1987 |
| Unlicensed |
| Xain'd Sleena | ? | 1987 |
EFO SA | Commercial |
| Xain'd Sleena | JP | 1986 |
Technōs Japan | Commercial |
| Xain'd Sleena | WORLD | 1986 |
Taito | Commercial |
| Xeno Crisis | ? | 2019 |
Bitmap Bureau | Commercial |
| Xenon | ? | 1988 |
Arcadia Systems | Commercial |
| Xenophobe | ? | 1987 |
Bally Midway | Commercial |
| Xevios | ? | 1982 |
| Unlicensed |
| Xevious | ? | 1982-12 |
Namco | Commercial |
| Xevious - Neo Geo Conversion | ? | |
Namco - tcdev | Commercial |
| Xevious 3D/G | JP | 1995 |
Namco | Commercial |
| Xevious 3D/G | WORLD | 1995 |
Namco | Commercial |
| Xexex | ? | 1991-01 |
Konami | Commercial |
| Xiao Ao Jiang Hu | CN | 1999 |
Subsino | Commercial |
| Xiaochou Jianianhua | ? | 201? |
IGS | Commercial |
| Xin Jin Huangguan | ? | 1997 |
IGS | Commercial |
| Xingyun Caishen | ? | 2001 |
Huang Yeh | Commercial |
| Xingyun Manguan | CN | 1996 |
IGS | Commercial |
| Xingyun Pao De Kuai | ? | 2005 |
IGS | Commercial |
| Xingyun Paomadi | ? | 1999 |
IGS | Commercial |
| Xingyun Paomadi Super | ? | 2003 |
IGS | Commercial |
| Xingyun Xiaochou / Xingyun Shouji | ? | 2004 |
IGS | Commercial |
| Xiyou Douniu | ? | 200? |
IGS | Commercial |
| Xiyou Shi E Zhuan 2 | CN | 2007 |
Huatong | Commercial |
| Xiyou Shi E Zhuan Super | CN | 1998 |
| Unlicensed |
| Xiyou Shi E Zhuan Super - Meng Xun Ling Shan | ? | 2020 |
| Unlicensed |
| Xiyou Shi E Zhuan Xin Qunmo Luanwu | ? | |
| Unlicensed |
| Xor World | ? | 1990 |
Gaelco | Prototype |
| Xtreme Rally / Off Beat Racer! | ? | 1998 |
SNK | Commercial |
| Xtrial Racing | ? | 2002 |
Konami | Commercial |
| Xybots | ? | 1987 |
Atari Games | Commercial |
| Xyonix | ? | 1989 |
Philko | Commercial |