New Kat Outfit - Finish score attack mode with high scores in all levels
New Ethan outfit - Finish stunt attack mode
Get Stunt Attack Mode - Finish Story mode
At the story mode screen press (where you can choose the levels): UP, DOWN, UP, DOWN, L1, L2, R2, R1, Select + X. When you enter the code correct you will hear a grind sound.
Press square, circle, triangle + square, square, circle, and start to select level.
To pass through objects, press square, circle, square + circle, square, circle, and start.
The Insider - Complete the Storage Level with a B ranking.
Naomi - Complete the game with a B ranking on each level.
Oscar - Complete the game with an A ranking on each level.
JJ Sawyer - Complete the game with an S ranking on each level.
To unlock a new Ethan outfit, beat Stunt Attack mode.
To unlock another outfit for Kat, beat Score Attack Mode with the high score on every level.