It didn't need to play Doom. It could have played Pong, it could have played Space Invaders, Pacman, Mario, Tetris. It could have played some variation of Flapp

It didn't need to play Doom. It could have played Pong, it could have played Space Invaders, Pacman, Mario, Tetris. It could have played some variation of Flappy Bird. There are lots of video games that are now more widely known than Doom. People who have never played an FPS have had Flappy Bird on their phone. Doom was unnecessarily ambitious. Awesome, but unnecessary.