During gameplay click and hold the Right analog stick and then enter one of the following codes on the D-pad to enable the corresponding effect. A confirmation message will appear in the bottom-right of the screen if the code has been entered correctly. When a code has been enabled you will not be able to earn medals.
Level Select: Up(2), Down(2), Left, Right, Left, Right
100,000 Resources: Right(4)
Auto Victory: Up(4)
Auto Defeat: Down(4)
ALL Tower Types: Up, Down, Left, Right
ALL Towers and Upgrades: Left, Up, Down, Right
Aliens cannot take Cores: Up, Left, Down, Right
Kill ALL Aliens: Left, Right, Left, Right
Kill ALL Aliens carrying Cores: Up, Down, Down, Up
Toggle Target Reticule: Down, Up, Down, Up
Free Camera Mode: Down, Up, Down(2). Press LB to move forward and RB to move back, use the Left analog stick to change the angle, and the Right analog stick to control the translation. Repeat a code to disable it's effect.