Similar to the previous titles, to unlock the challenges of olympus in God of War 3 for PS3 you must simply beat the game on any difficulty.
About DoubleDizle
Gamer, Software Engineer, Web Developer, Professional Geek
You also might be interested in
To unlock the Combat Arena in God of War 3[...]
If you’re tired of having to hit those buttons at[...]
To unlock the Chaos difficulty in God of War 3[...]