Use the following cheat codes:
MPCASPER: Invisibility
MPVADER: Invincibility
MPPLAYALLDAY: Infinite Lives
MPBUNZ: Makes Claw Strong
MPFRANKLIN: Lightning Sword
MPGANDALF: Full Magic
MPFREAK: Catnip
MPKFA: God Mode
MPLOADED: Full Ammo
MPSTOPWATCH: Timer
MPPOS: Shows global position
MPFPS: Frames per second
MPOBJECTS: Shows # of objects on screen
MPLITH: Monolith logos & Music
MPSHADOW: Makes Claw a shadow
MPSUPERTHROW: Super Throw mode
MPHOTSTUFF: Fire Sword
MPMOONGOODIES: Bouncing treasure
MPSPOOKY: Makes Claw invisible to enemies
MPPENGUIN: Ice Sword
MPAPPLE: Full Health
MPHAUNTED: Makes Enemies into ghosts
MPBOTLESS: background off/on
MPMIDLESS: middle plane off/on
MPTOPLESS: foreground off/on
MPINCVID: Increases the Resolution
MPDECVID: Decreases the Resolution
MPDEFVID: sets default Resolution
MPJAZZY: 320X200 Resolution
MPWIMPY: makes Claw weak
MPJORDAN: makes Claw jump high
MPDEVHEADS: Shows developers heads instead of treasure
MPBLASTER: Full dynamite
MPSAVE: All levels
Use the following codes to get to the level you want:
Level 1: MPCHEESESAUCE
Level 2: MPEXACTLY
Level 3: MPRACEROHBOY
Level 4: MPBUDDYWHAT
Level 5: MPMUGGER
Level 6: MPGOOFCYCLE
Level 7: MPROTARYPOWER
Level 8: MPSHIBSHANK
Level 9: MPWHYZEDF
Level 10: MPSUPERHAWK
Level 11: MPJOBNUMBER
Level 12: MPLISTENANDLEARN
Level 13: MPYEAHRIGHT
Level 14: MPCLAWTEAMRULEZ
Complete level: MPSCULLY
Previous level: MPMOULDER
Boss warp: MPSKINNER