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Dreamcast - Confidential Mission cheats

Select any mission:
Finish the game on any difficulty mode with the good ending.

Unlock Another World option
Finish all training levels in Agent Academy mode

Unlock Sega lightguns
Finish all training levels in Agent Academy mode

Unlock 12 Bonus training levels
Finish Another World mode once

Unlock Gold guns
Finish training levels 1-18 in Agent Academy mode