Enter any of these codes at the Start screen. You'll know that your code has been entered correctly as the game will acknowledge correct entry by either a screen flash or a sound or both...
All codes should be entered quickly to work (usually within 3 seconds of when you start to enter the code).
Big Head Aliens
Square, Circle, Circle, Square, Up, Square, Circle, Circle, Square, X
Big Head Player
Square, Circle, Circle, Square, Up, Square, Circle, Circle, Square, Triangle
Goodies Option
Triangle, Square, Circle, Left, Square, Triangle, Square, Circle, Left, Square
Grayscale Graphics
X, X, Triangle, Triagle, Square, Squate, Circle, Circle, Up, Down
Nakomi Mode
Up, Up, Down, Down, Left, Right, Left, Right, X, Circle
Sepia Graphics
Enter Left(10) within three seconds.
Stage Select
With the goodies code enabled, enter Left, Right, X, Triangle, Left, Up again at the start screen. You should now see a stage select option becom available somewhere
We have more cheats and tips for this game here, Assault: Retribution cheats
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