Secret Multiplayer Level
Put in 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
Put in the code HPPYHPPY

Select level
Put in the code 8ODYS

All Levels
Enter DOYDS in password screen

All Levels
Put in DOYDS at the password screen

Get Custom Gang 1
Put in the code TRDDYBRRKS. OR Type in 4 times to get 4 custom gangs

Get Brandon Game
Put in the code NNKNHCKS

Get All Weapons
Put in the code RCKTSRDGLR

Suicide
During play press C-Up + C-Down + C-Left + C-Right. Useful if you are using invincibility, etc.

More Powerful Weapon
Get 15 of any 1 weapon then aim and press A + B + Z to fire a super version of that weapon (Except Grenades)

Big Grenade
There is a super grenade. most people say there isn't but if u collect 10 grenades and press change weapon and fire 2 at the same time a grenade will come out then grow bigger and explode bigger.

Avoid Nukes (multi-player only)
First of all start with shadow ops as a team or get teleporters from the weaponds on the ground. When you hear "nuke deployed" switch to the teleporters and when the screen turns yellow fire the the teleporters once only. this code needs some timing amd if your are right by the nuke when it explodes the cheat will not work.

Nuggets of Wisdom
To get some nuggets of wisdom from the Battle Tanx team, first make your way to the Arizona truck stop. It's about the third stage in one player mode. Get some guided missiles and go back to about where you started the stage. Control a guided missile to the dessert that should be to your left. You should see a white car, hit it. There you go! Little mesages should scroll at the bottom of the screen.