What are the available bonuses in the extras menu?
Solution 1:
Like Final Fantasy XIII, extras are unlockables you can use out-of-game when you complete certain objectives. They're always tied to major achievements, like completing the storyline or non-trivial achievements (gold or platinum trophies in the PS3 version)1.
- For the PS3 version, the extras available are XMB themes.
- For the XBox 360 version, the extras available are gamer pictures/icons.
Note 1: GameFAQs has the specific info about how to unlock them.