Type in t then enter these codes
lara croft - gives you all weapons and ulimited ammo
mario - warp to any level
griswold - 200 in all armor
spork - 200 health
keymaster - all keys
To get all items press "T" then in the dialog box
type items.
To get all guns press "T" then in the dialog box
type guns.
To get all ammo press "T" then in the dialog box
type ammo.