A cheat or cheating generally refers to either a cheat code that is hard-coded in the engine, or a separate or modified application (often called a hack or cheating hack) that allows a player to play with an unusual advantage. The following articles deal with the different types of cheats or cheat-related applications:

• cheat codes hard-coded in Doom and Doom II
• cheat codes hard-coded in PlayStation Doom
• cheat codes hard-coded in Heretic
• cheat codes hard-coded in Hexen
• cheat codes hard-coded in Strife
• cheat codes hard-coded in Chex Quest
• cheat codes hard-coded in source ports
• Cheating hacks
• TAS, or tool assisted speedrunning
• cheat codes hard-coded in Doom 3