Enter Neon's profile in the characters menu and type "ziocleto". Begin a game and Neon will appear as a skeleton during his missions.
At the main menu, hold [Shift] and type "mensaaaa" to enable cheat mode. If you entered the code correctly, the phrase "That's what I need" will be spoken. Then, enter one of the following codes during a game to activate the corresponding cheat function:
|Level skip||[Left Shift] + [Left Ctrl] + A|
|Level restart||[Left Shift] + [Left Ctrl] + R|
|Continue mission if failed||[Left Shift] + [Left Ctrl] + C|