DungeonDoom is a Doom3 modification for Windows and Linux operating systems. It incorporates most key features of roguelike games. In particular, levels are largely composed of mazes, which are generated with a pseudo-random number generator. Levels have stairs leading either to higher or lower levels of the dungeon.

The lower the player descends into the dungeon, the stronger the enemies get. Killed enemies drop gold which then can be used by the player in shops to buy weapons and ammo . Much of this functionality is not part of the original Doom3 engine and has been added to DungeonDoom. The modification is highly extensible and the current 6.0 builds of DungeonDoom include an overworld, a storyline, random quests, special level bosses with special abilities, a magic system, an equipment system, a character developement system and a player ability system.