The game presents a table-top adaptation of ID Software's computer game series DOOM. Characters have three Traits (Health, Time Left, and Bodycount - sort of like hit points) that begin with values distributed from a point pool. Characters also select a Stance, which determines what their goal is during the game. The rules also present a Morale system for characters which may force them to alter their Stance.
During the game characters attempt to gather Keys so they may descend to another level to complete their mission. Humorously, the game includes the infamous "cheat code" from the video game, allowing characters to say the word "idkfa" to gain all the Keys for the current level.