Doom references in other games

Super Mario Fusion is a fan-made 2D game made by JudgeSpear2 in Game Maker 7 Pro using a heavily modified version of the Super Mario Bros. Hello Engine III. The theme of the game is crossovers with other games. Levels based on Mega Man, Halo and other games are already included in the demo version, as well as new enemies such as the Grunts and Covenant from Halo.

World 4 will be themed around Castlevania, Ghosts 'n Goblins and Doom. The demo version so far includes World 4-2 "Tower of Babel", which incorporates graphics and music from Doom. The World 4 map is that of Doom Episode 2's intermission map. Tower of Babel incorporates coded Imps and Cacodemons, as well as a functioning Cyberdemon boss. Mario may pick up and fire Doom's rocket launcher in the boss battle.