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

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

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