On the "Command Line", make sure the command line is in quotes and add set sv_cheats after a space, so it resembles: If using Windows XP, right click on the single play shortcut. "C:Program FilesReturn to Castle WolfensteinWolfSP.exe" set sv_cheats 1 Edit your Windows 9x/ME Desktop Shortcut for the game and change the "Target" field to: They do not work in the demo or multi-player games. The following codes will work on the single player retail version of the game, and only on a saved game.