To pull up the cheat entry screen, select the "new game" option at the main menu. Hold down L, R, and Z. Then press left, up, down, A, right, B, start. Then enter any of the following codes:
BACKSTABBER: One hit gunpod kills CLEAR: Turn off active cheats FLIPSIDE: Upside down mode MARSBASE: Faster missile regeneration MIRIYA: Missiles and Gunpod power faster MISSMACROSS: All paint jobs MULTIMAYHEM: All multiplayer levels SNIPER: One shot sniper kills SPACEFOLD: Gunpod powers up faster SUPERMECH: Invincibility WEWILLWIN: All levels WHERESMAX: All medals and Veritech models
