1)At the options screen, press 6,8,2,4 the screen border will flash.
2)Now, you can choose the insane difficulty.
Contributed By: jcoelho.
At the Options screen, push the following button combination:
Effect Code Invincibility 8, 3, 0, 5, 5, 7, 2, 6
At the options screen, press 2, 8, 8, 8, 6, 6, 7, 7, 3, 7, 7. While playing, press * to fail the current mission or # to pass.
It takes a lot of ammo to keep a soldier happy. For a limitless supply, press 2, 7, 2, 8, 3, 7 at the Options screen.
Unlock All Levels and Weapons
Level Select and All Weapons
At the Options screen, press 3, 7, 6, 6, 8, 2, 4, 2. The screen border shimmers if the code is entered correctly. When you begin the game, all 16 missions are selectable and all weapons are available.
To view the ending, enter the following button combination at the Options screen, then choose Start Game:
Effect Code View Ending 7, 2, 4, 4, 9, 8, 0, 1
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