Shellshock

During a mission, hit [Esc] and type
CHEESY PEAS: Infinite Shields
RATTY RAT RATTY: Full Armour (shield)
ELVIS LIX: Full Engine
EDDIE PANTS: Full Tracks
TENDRIL: No collision detection
THE FEARNS: Full Armourment
BEARDED LADY: No drowning
BELL: Jump to a level
GRIFTA GRIFTA BIFTA: Stoned mode
(Information from Cheat Machine)