DLKTDR	Pen and Ink Mode (black and white wireframes)
SNFFRR	Disco Mode (strobe lights and dancing enemies)
FRTHSTHTTRLSCK	Infinite Lives
THBST	Gallery (view, scale and rotate all 3D enemies)
FDTHMGS	Show Credits
THSSLKSCL	Spirit Mode (invincibility and slow-moving enemies)
CMGTSMMGGTS	All Weapons
BLLTSRRFRND	Unlimited Ammo
RBNSMTH	Robins cheat (invincibility, all weapons, unlimited ammo, big heads, and credits.)
DNCHN	Small enemies
GRGCHN	Greg's cheat....
NSTHMNDNT	See all enemies on the map (they are represented by red arrows)
CLLTHTNMTN	Quack mode (choppy animation)
LLTHCLRSFTHRNB	Purdy colors (turns all rocks, etc. really cool colors)
NTHGTHDGDCRTDTRK	The Big Cheat!
LKMBRD	Fly mode. Use L to go lower, and R to go higher.

GameShark Codes

Activate Pulse Rifle	80128e570001

 
Activate Quad Rocket 	80128e670001
Launcher

  
Activate Alien Weapon	80128e6b0001

  
Activate Chronoscepter	80128e730001
	  
Activate Fusion Cannon	80128e6f0001
   
Activate Mini Gun	80128e5b0001

 
Activate Particle	80128e630001 
Accelerator
 

 
Unl. Rifle/Alien	80128e0b00ff
/Particle Ammo

 
Unlimited Chronoscepter	80128e3300ff 
Ammo
 
Unlimited Fusion Cannon 80128e2f00ff
Ammo 


Unlimited Mini Gun Ammo	80128e2300ff

 
Unlimited Quad Rocket	80128e2b00ff  
Ammo	

  
Unlimited Tek Arrows	80128e0f00ff

  
Activate Assault Rifle	80128e530001

  
Activate Automatic  	80128e4f0001

Shotgun 
 
Activate Grenade	80128e5f0001 
Launcher	

 
Activate Pistol		80128e470001

 
Activate Shotgun	80128e4b0001

 
Have All Keys		80128e830007
			80128e870007
			80128e8b0007
			80128e8f0007
			80128e930007
			80128e970007


Extra Cheats		81119690ffff
			81119692ffff
 
No Limits		8011968c0008


Unlimited Arrows	80128e1f00ff 


Unlimited Pistol/Rifle	80128e0300ff


Have All Keys		80128e9b001f

Thanks to Revolution readers Wally Drumhiller, RaGnRaPtOr, Doom11 97, Lee Fleisher, Linda Cornett, David 7777, and Jimmy Pecora!!