No revenue estimate for XBOX — its rating/review counts don't calibrate to sales the way Steam's do. Reviews and prices only.

DOOM + DOOM II

Developed by id Software, and originally released in 1993, DOOM pioneered and popularized the first-person shooter, setting a standard for all FPS games. The critically acclaimed sequel, DOOM II, followed in 1994. Now the definitive, newly enhanced versions of DOOM + DOOM II are available as a combined product.