God of War 3: Unlimited Rage of Sparta

To unlock infinite Rage of Sparta for bonus play in God of War 3 for the PS3, you need to find Zeus’ Eagle.  Climb the wall to the right of the Heart of Gaia and it will be right there on the ground.

Note that this is a bonus item and can only be used during bonus play, which can be enabled once you beat the game at least once.  Turning on bonus play automatically disables trophies.