Kweepa released the game Doom for the Commodore VIC20. For the game you will need an Commodore VIC-20, a 35 KB memory expansion and a disk drive. The game has 8 levels, 4 enemies, 5 weapons, 11 music tracks, 20 sound effects, cheat codes, a map screen, corpses, secrets, pick-ups, exploding barrels, intermission and victory screens, and more!