Oni cheats and cheat codes for Playstation 2

While playing a game, press Select. Highlight "Help" option, then
press any of the following button combinations. Note: Sound will confirm, 
if the entered codes are accepted. Repeat the code to disable the 
cheat effect.

Skip stages: 
L2, L1, L2, Square, Circle, Square, L3, R3, L2, L1.

Invincibility: 
L2, L1, L2, Square, Circle, Square, R3, L3, R3, Circle. 

Unlimited ammo: 
L2, L1, L2, Square, Circle, Square, L2(2), L1, L3. 

Infinite Phase Cloak: 
L2, L1, L2, Square, Circle, Square, L1, R3, L2, L3. 

Refill hypo: 
L2, L1, L2, Square, Circle, Square, Circle(3), R3. 

Weapons fire without pause with infinite ammo:
L2, L1, L2, Square, Circle, Square, L2. L2, L1, L3. 

Fists Of Legend mode:
L2, L1, L2, Square, Circle, Square, R3, L3, Circle, Square.

Single-hit kills:
L2, L1, L2, Square, Circle, Square, L3, R3, Circle, Square.

Character select:
L2, L1, L2, Square, Circle, Square, L2, L2, L2, L2. 

Small characters:
L2, L1, L2, Square, Circle, Square, L3, R3, Square, Circle.

Giant characters:
L2, L1, L2, Square, Circle, Square, R3, Square, Circle, L3.

Giant head:
L2, L1, L2, Square, Circle, Square, Start, Square, Circle, Start.

Unlock Hard mode:
L2, L1, L2, Square, Circle, Square, R3, L3, Circle, Square. 

Avoid fall damage
If you falling from a high place, press L2 close to the ground to
flip. You will not get a damage.