Ice Nine - Platform: Gameboy Advance

Cheat mode:
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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.

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

Cheat menu (unlimited health and ammo, mission select)
Beat 1st 15 missions on Graduate. Go to "Start Game" to activate cheat 
menu and play any mission with cheats.

Open doors:
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When reaching a door or gate that requires a switch to open, 
hold L + R + Select until the screen flashes the phrase "Trust no one" 
is spoken.

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