Enter on the extra menu:

Code - Result

SELECT, R1, L1, SELECT, R3, L1 - Infinite supplies
LEFT, RIGHT, UP, DOWN, L3, SQUARE - Infinite health
L2, RIGHT, CIRCLE, DOWN, R1, SELECT - Hippy blood
UP, UP, UP, R2, R2, UP - Extreme ragdoll
SQUARE, SQUARE, CIRCLE, CIRCLE, UP, DOWN - Low gravity ragdoll