How to unlock all secret cheats How to unlock all secrets (cheats) Demigod Defeat the Warlord on Chapter 4 (Hard Difficulty) Invincibility Defeat Oblivion on Chapter 5 (Hard Difficulty) All Weapons Defeat Oblivion on Chapter 5 (Any Difficulty) All Character Weapons Defeat Oblivion on Chapter 5 (Hard Difficulty) Infinite Ammo Defeat Alpha Fireborn on…