Unlock Hard, Hyper and Maniac Modes:
When you have beaten the game for the first time you will also unlock additional Hard, Hyper and Maniac difficulty modes that you can select in New Game+.
Unlock New Game+ Mode:
This feature becomes unlocked when you have beaten the game for the first time. In New Game+ you retain everything when the clock restarts and the enemies will be more difficult to defeat.
When you have beaten the 8 levels and defeated the bosses you will play a prison stage. When you have beaten that prison level you will unlock Co-Op mode where you can choose to play between Beck, Call, or Random Character.