Original URL: http://www.psxextreme.com/psp-cheat-print/139.html
Justice League Heroes

To enter these codes, pause the game and hold L and R

20 Free Shields
Up, Up, Down, Down

25 Free Boosts
Left, Right, Left, Right

God Mode
Left, Down, Right, Up, Left, Down, Right, Up

Max Abilities
Right, Down, Right, Down

Unlimited Mana
Down, Down, Right, Right, Up, Up, Left, Left

Unlock Everything
Down, Left, Up, Right