Doom 2:
Hell on Earth

Network cheat mode:
Hold [Alt] and type iddtiddtiddtiddt in map mode.

Deathmatch cheat mode:
Type t in the map to enter talk mode. Hold [Alt] and type iddt several times. This will reveal the entire map. Repeat the code to reveal All items. Repeating the code again will return the map to normal.

Permanent turbo:
Start the game with the doom2 -turbo 250 command line to have your player in turbo for the entire game.

Wolfenstein:
Type idclev32 or idclev31 during game play to restart in a totally new level. When you complete one of those levels you will always start on the level suburbs and continue your Doom 2 game.

Cheat mode:
Enter one of the following codes during game play to activate the corresponding cheat function.