- XPyramid War
- XQ*bert
- XQ, Bert
- XRat & Carrot
- XReconnaissance
- XRiver Raid
- XRiver Raid I
- XRiver Raid I
- XRiver Raid II
- XRiver Raid II
- XRiver Raid III
- XS.O.S.
- XSahara War
- XSea Ghost
- XSea Hawk
- XSea Quest
- XSeesaw
- XSerpent Tank
- XSerpents
- XSki
- XSki Hunt
- XSki Run
- XSkydiver
- XSkydiver
- XSkydiver
- XSkyscraper
- XSpace Channel
- XSpace Invader
- XSpace Raid
- XSpace Robot
- XSpace Tunnel
- XSpider
- XSpider Fighter
- XSpider Man
- XSquirrel
- XSuper Man
- XSuper-Cowboy
- XTank Mission
- XTank Mission
- XTennis
- XTennis III
- XTom Boy
- XTonky Kon
- XTooth Brush
- XTuby Bird
- XUFO
- XValleyball
- XVolleyball
- XWhale Hunter
- XWorld End