How to get and use codes:
Identical for R&C3 (Up your Arsenal) and Gladiator (Deadlocked):

1. Type in your username into the input box. The codes will generate as you type.
2. On your selected game, go to multiplayer and then Edit Profile.
3. Change your username to the username you typed in. Capitalization doesn't matter.
4. While holding L2, use the D-Pad to enter your cheat codes.
5. If the code was successful, a popup will appear to indicate you have unlocked the skin.