Press the "~" key (next to "1") during the game and enter the following commands in the console window: "GOD" - Invincibility ON/OFF "GIVE 2" - Activates Weapon 2 "GIVE 3" - Activates Weapon 3 "GIVE 4" - Activates Weapon 4 "GIVE 5" - Activates Weapon 5 "GIVE 6" - Activates Weapon 6 "GIVE 7" - Activates Weapon 7 "GIVE 8" - Activates Weapon 8 "GIVE S 255" - 255 Shotgun Shells "GIVE C 255" - Battery Charged "GIVE R 255" - 255 Rockets "GIVE N 255" - 255 Nails "GIVE H 999" - Health to 999 "IMPULSE 9" - All Weapons and Ammo "IMPULSE 11" - One Rune each; can be used 4 times "IMPULSE 255" - Activates Quad Damage "FLY" - Flight Mode ON/OFF "R_FULLBRIGHT x" - Set Brightness (x = a number, e.g. 10) "NOCLIP" - Clipping OFF/ON, you can walk through walls "MAP ExMy" - Go to Map x and y = enter numbers "NOTARGET" - Invisible/Visible "MAP START" - Jump to Start "MAP END" - Jump to Final Boss "CROSSHAIR X" - Crosshair Close the console window by pressing the same key (~) again.