Clean Screen and Change Split Screen
Code Effect During a two-player hold Select + R1 and press Left or Right Change Split Screen During gameplay hold Select + R1 and press Up Clean Screen
Contributed By: piecemealcranky.
First you must enter the Enable Cheat Mode code, ''Cheat Mode!'' will appear at the top of the screen. Enter the following during gameplay for the combo you want to execute:
Code Effect Left, Right, Up Cash Suck Combo Left, Right, Down Drop a Mine L1 + R1 + R2 + Select Enable Cheat Mode L1 + R1 Jump Right, Left, Up Stun Combo (front) Right, Left, Down Stun Combo (rear) Up, Down, Left Tilt on two left wheels Up, Down, Right Tilt on two right wheels
Contributed By: flowerpot.
Before entering the following codes you must first enter the ''Enable Cheats'' code.
Code Effect At the options screen press Triangle, Square, R2, X, Triangle, then start a game on Challenge mode and select Nuke York Big Daddy During gameplay hold L1 + R1 + R2 + Select Enable Cheats Hold L1 + L2 + R1 and press Up, Down, Left, Right God Mode Hold L1 + R1 and press Up, Down, Up, R2 Infinite Weapons Hold L1 + R1, press Up, Down, Left, Right Invincibility Hold L1 + R1 + R2 + X and press Down Stronger Weapons Circle, Square, R2, X, Triangle, R2 Unlimited Jump
Use the following button combinations at the options screen to unlock the following characters
Code Effect R1, Square, X, Square, L2, Circle Alien Saucer Triangle, Square, R2, X, Triangle, R2 (Challenge Only) Big Daddy Triangle, L1, R1, X, L2, L2 Goliath L1, Triangle, R2, Triangle, Triangle, R1 Helicopter R1, R2, L1, L1, X, Circle Nightshade
Contributed By: puddntater.
Enter the following at the password screen:
Password Effect L1, Triangle, R2, Triangle, Triangle, R1 Agent XQJ-37 R1, Triangle, R1, Triangle, L1, Square Armor Power-Up L1, L2, Circle, L1, R1, Square Double Pick-Ups Square, Square, Circle, Circle, Triangle, Triangle Duke Nukem Trailer X, Circle, L2, X, Square, L1 Funtopia Level Triangle, L1, R1, X, L2, L2 Goliath L1, Triangle, R2, Triangle, Triangle, R1 Helicopter Square, X, Circle, Triangle, R1, R2 Infinite Turbos R1, R2, L1, L1, X, Circle Nightshade R1, R2, L1, L1, X, Circle Nightside R1, R2, L1, L1, X, Circle Play as Nightshade Triangle, L1, R1, X, L2, L2 Stillbirth R1, Square, X, Square, L2, Circle UFO R1, Square, X, Square, L2, Circle Xagnar The Abducter
Blow Up Earth and God Mode
Start the level Area 51. Next, upgrade the remote mines to the highest level, and lay them next to the crashed saucer in the corner of the level. Go to the middle of the level and use the teleport to get up to the moon. Once on the moon, detonate the mine. The earth will then blow up in a huge explosion. Afterwards, fragments of the earth will crash into the moon and make it explode too, and you will be stuck out in the middle of space. You will have full health and weapons out in space, but nothing to do with them. Quit the level and start another and God Mode will still be activated with all weapons and invincibility.
Contributed By: mootootwo.
Secret Area in Quake-A-Roni
Once fighting in Quake-A-Roni, you may see a building that seems to be tilting in one direction. Fire a few missles at it and watch it blow. Once that is over, notice a building nearby has a hole in it. Now drive through where there's a few weapon pick-ups and a monument to blow up.
Contributed By: Carter12.
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