Taking place at a carnival according to the Game's manual, Demons to Diamonds plays similar to Space Invaders. You control a gun that travels along the bottom of the screen, shooting a variety of targets including demons and skulls, the latter return fire upon the player. As the name suggests, upon shooting the demons, they transform into diamonds, which must then be shot for points.
Players use the Paddle Controller for gameplay.
Demons to Diamonds has the illustrious honor of being among the games in Game Room.