In order to unlock these rewards, the game must be completed on any difficulty.
|Unlockable||How to unlock|
|Comic Book||Finish the story mode|
|Infernal Difficulty||Finish the story mode on any difficulty|
Complete the game once on any difficulty to unlock a new costume for Dante available on subsequent playthroughs.
Complete the game on any difficulty to unlock the bonus Gates of Hell arena.
After you complete the game on any difficutly, you have the option to import your current stats and relics into a new playthrough. This is basically a New Game+.