Enter the following code on the Main Menu screen after selecting your save slot and make sure you get an audio confirmation. This unlocks the option to select a costume skin when you load your save:
Left, Left, Down, Down, Left, Left, Right, Up, Up, Down
New Game+ is a separate save file you can create after meeting the requirements below. While the difficulty in New Game+ is increased, you get to keep any tools acquired during your first run through the game.
|Unlockable||How to unlock|
|New Game+||Beat story mode on Normal or Hard difficulty|