Jak & Daxter - The Precursor Legacy - Platform: Playstation 1

Unlimited Health 
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Pause the game then press the following: up, left, left, down, 
right, x, triangle 

Faster Zoomer
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Hold L1 + R1 to go faster on the Zoomer, at the expense of 
maneuverability.

Turn faster when flying
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When flying, hold L1 + R1 while turning. This will insure a 
sharper turn.

Super jump
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Press L1 + X. If timed correctly, you will go into a crouch 
position and spring higher that you would by double jumping 
(X, X).

Avoid fall damage
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Press Circle to spin kick just before you hit the ground and 
you will land perfectly every time.