Unlockables -

Athena costume - Finish the game on Titan mode.

Hercules costume - Finish the game on Titan mode.

Hydra Armor - Finish the game on any difficulty level.

God Armor - Receive God ranking in Challenge mode.

God of War costume - Finish the game on any difficulty level.

Dark Odyssey costume - Finish the game on God mode.

Titan difficulty mode - Beat the game on any other difficulty mode.

High Definition Mode - Press L1, L2, L3, Circle and Square simultaneously before the "Sony Computer Entertainment Presents" screen. The letters will turn purple if entered correctly.