Cheat Mode
To active cheats, in the main menu, hold down the [Shift] key and type MENSAAAA and you'll hear a guy say "thats what I need." After that during the game you can type the following cheats:
[Left Shift] + [Left Control] + A - Skip level
[Left Shift] + [Left Control] + R - Restart level
[Left Shift] + [Left Control] + C - Continue if mission failed
G - God mode
Also, enter Neon's profile in the characters menu and type in the code "ZIOCLETO", once you reach a mission with neon, you will play the mission with his skeleton.