Sony Playstation Games Solutions - One of
the Largest Games Source for PSone Cheats, PSX Codes, Hints, Tips,
Walkthroughs, FAQs and Games Strategy Guides.
After pausing the game, hold R1 and press Triangle,
Square, Square, Circle, Circle, X, X, Triangle. If done correctly,
you'll hear a roar. Resume gameplay and you'll be invincible.