While playing, press ` (tilde) to bring down the console window, then type the following codes:
Code - Result
toggle g_p_god - God Mode
give all - Give All Items
give ammo - Give Ammo
give jetpack - Give Jetpack
give forcefield - Give ForceField
give life - Give Life
pause - Pause Game
toggle g_map_info - ???
toggle r_timings - ???
toggle r_stats - ???
toggle g_debug - ???
camera camera - ???
camera player - ???
kill - ???