New Systems

Nintendo DS
Nintendo Wii
PC
Playstation 3
Sony PSP
Xbox 360

Iphone

Older Systems

Dreamcast
Gamecube
Gameboy Adv
Gameboy Colour
Macintosh
Nintendo 64
Playstation
Playstation 2
Xbox

Other

DVD Eggs

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Bonus missions:
Complete the first fifteen missions under a difficulty setting greater than "Initiate" to unlock three bonus missions.

Cheat mode:
Complete the first fifteen missions under the "Graduate" difficulty setting. A cheat menu with unlimited health, unlimited ammunition, mission select option will now be available.

Veteran difficulty:
Complete the first fifteen missions under the "Graduate" difficulty setting.