Fly Flymode On/Off NoClip No Clipping On/Off Impulse 11 God Mode Impulse 43 First of the five impulses that cause death Impulse 69 Second of the five impulses that cause death Impulse 137 End Credit Music Impulse 151 Third of the five impulses that cause death Impulse 666 This is the impulse that crashes the game Map n Warp (where "n" is the level name)