Ice Nine - 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.