Hold SHIFT while starting the game. Select the "Developer" tab and check "Developer Mode" to continue loading the game. To start the game, hold CTRL and click on "New Game" to set a difficulty setting and location. Press \ to talk during game play, then activate the following cheats by performing the corresponding codes:
CHEAT FUNCTION - CHEAT CODE Change speed; may crash game - fov <6-93> Disable debug mode - debug off Enable debug mode - debug on Full health - smoghead God mode in last stage - iamgoddess God mode [NOTE 1] - iamgod Kill nearby enemies - giants Land when flight mode is active - drop List weapon names in debug mode - all weapons Obtain indicated item - gimme Obtain indicated weapon - give Remove fog - foghack Set game speed; may crash game - speed <1-50> Switch view to nearest enemy - switch Toggle flight mode - floy Unlock doors - opensezme
NOTE 1: This code has no effect in the last stage of the game.