Doom 3 Cheats

When you start the game, go through out the game and find the kitchen before 'all hell breaks loose' and in the corner of the kitchen you'll find an arcade game...On the screen is the face of the original Doom character...And he also makes the same faces when you punch and kill the turkey... Get a highscore of 25,000 or higher to get a mail on your PDA.

In the final level, Excavation Site, after going down the elevator into Hell, stick to the left wall. Make sure to stay to the left, or the final cutscene will trigger. You should come to a dead end with candles barely lighting a brick with the id logo in the center. Click this brick and a wall will open to your left. Walk inside the room to find the id Software PDA containing "Thank You" emails from the staff.

In the console, type in any of the following to recieve a message: iddqd, idkfa, idfa, idclip, and idchoppers. You do not need to press enter to recieve the message.