XCOM: The Board Game

iOS

Xelorians - Space Shooter

Android

Xevious

Nintendo 3DS

X Construction

Android

X-mas Puzzle

Mobile

X Games SnoCross

iPhone

XenoWars (Smartphone)

iOS + Android

Xtreme Quad Racing

iPhone

X-Men Origins: Wolverine (mobile)

Mobile

Xiangqi - Chinese Chess

iPhone

X-Plane 9

Android + iPhone

Xango Tango

Mobile

X-Men: Genetix

Mobile

X-Men: The Last Stand - Mind Maze

Mobile

Xanadu NEXT

Nokia N-Gage (1st Generation)

X-Men Legends

X-Men Legends II: Rise of Apocalypse

Sony PSP + Mobile + Nokia N-Gage (1st Generation) ...