Destroy All Humans! In a mission, bring up the Start Menu, hold L2, and enter the codes: Square, Circle, Left, Left, Circle, Square Invincible Left, Circle, R2, Right, R1, Square Infinite Ammo R1, R2, Circle, Right, R2, Circle Infinite Mind Power R1, R1, R2, R2, Left, Right, Left, Right, R2, R1 Increase DNA (Board Mothership then enter this one) Square, Circle, Left, Left, Circle, Square Upgrades for Current Weapons (Board Mothership for this one too) Right, Square, R2, R1, Right, R2 Maximum Alert Meter R2, Right, R2, R1, Square, Right Resets Alert Meter