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To slowly restore your health, shoot any water object, like a water fountain, or
fire hydrant, and stand in the water. While standing in the water, hold the action button and your health will slowly be revived.

On the stadium level, look up and you'll see a blimp that says "Duf Beer." If you shoot it with your missile launcher, it will explode and lots of ammo, health packs, and other helpful items will fall onto the field.

When in a bathroom, walk up to a toilet and press TRIANGLE. Duke will go to the bathroom and his power will go up 10 points.

Pause the game and press X, X ,O, Square, Triangle, Triangle, Left, R2.

To make yourself invincible pause the game and then press L1, R2, R1, R1, L2, R2.

To throw multiple pipebombs, throw a pipebomb, then hit CIRCLE and throw another.
Lather, rinse and repeat for up to 9 pipebombs at once.

------------- Episode 1 To get to the Launch Facility you must go to the last lighted area before the exit in the Toxic Dump level, you will see a cracked wall that hides the secret level exit. Episode 2 In Occupied Territory when you are half way accross the bridge to the exit, turn
and look back at the control booth. There is a switch high up on the column to the right of the booth. Shoot the switch to open the secret area left of the bridge when you face the control booth. Secret Level 2 In the Dark Side,well on the other side of the obelisk, there is a cracked wall.
Inside is a passage to the Lunatic Fringe secret level. Episode 3 In the Movie Set next to the yellow key card and a sattelite there is a USA sign. Push the sign to access the secret level Tier Drops. Secret Level 2 In Hotel Hell there is a waterfall that hides a teleporter. Get in the telaporter and blow away the flaming pots to get to Freeway.