Pitfall - The Lost Expedition - Platform: Playstation 2

Bottomless Canteen:
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Hold L1 and R1, and then press LEFT, SQUARE, CIRCLE, DOWN, 
SQUARE, X, SQUARE, CIRCLE. 

Unlock Hyper Punch Mode:
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On the title screen, hold L1 + R1 and press LEFT, RIGHT, 
CIRCLE, UP, CIRCLE, RIGHT, LEFT. 

Unlock Original Pitfall:
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On the title screen, hold L1 + R1 and enter CIRCLE, CIRCLE, 
LEFT, RIGHT, CIRCLE, SQUARE, X, UP, CIRCLE.