Type these while playing:
 

   KMFDM       Backpack of Holding (full ammo)
 

   OMNI        Omniscience (reveal map)
 

   CHANNEL7    Godmode on/off
 

   BELFAST     Deathkiss (kill all enemies)
 

   RAVEN       Ambrosia (full health)
 

   BEAVIS      Get objective items. Only 100 points left to complete level.