Click the right analog stick (sometimes called R3) and hold it while entering these codes on the D-pad for the desired effect. A sound will occur when you enter them correctly. Cheats disable medal earning.

• DOWN, DOWN, DOWN, DOWN - Self-destruct
• DOWN, UP, DOWN, UP - Toggle target reticle
• UP, DOWN, LEFT, RIGHT - Unlock all tower types
• RIGHT, RIGHT, RIGHT, RIGHT - 100,000 resources
• UP, LEFT, DOWN, RIGHT - Cores can't be taken
• DOWN, UP, DOWN, DOWN - Free camera mode
• UP, UP, UP, UP - Instant victory
• LEFT, RIGHT, LEFT, RIGHT - Kill all aliens
• UP, DOWN, DOWN, UP - Kill all aliens carrying cores
• UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT - Level select