Secret Multiplayer Level- Input the code WRDRB.
Super Weapons- If you press A+B at the same time, you will shoot a super version of the weapon selected. This works with every weapon but health or The Edge.
Invincible- Input the code HPPYHPPY.
Level Select- Input the code 8ODYS.
Get Custom Gang 1- Input the code TRDDYBRRKS.
Get Brandon Game- Input the code NNKNHCKS.
Get All Weapons- Input the code RCKTSRDGLR.
More Powerful Weapon- Get 15 of any one weapon, then aim and press A + B + Z to fire a super version of that weapon (Except Grenades).