Various Cheats and Hints
Level select
At the main menu hold R2 then hold R1 Release R2 then release R1 Hold L1 then hold L2 Release L1 then release L2 Then press Circle Square
Invisible player
To have your character be invisible press R1 L1 X 0 0Square Square R1 and 0 at the main menu
Unlock all weapons
To unlock all the weapons in the game press X twice then Triangle O Up Up Down Square and then Triangle at the main menu
