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Playstation 2 - Super Robot Taisen: Scramble Commander cheats

Unlock Hard Mode: Finish story mode once
Unlock Trial Mode: Play in hard mode and finish the story mode
Extra Mode: Play in hard mode and finish story

Different Hisatsu:
Increase shooting skill to +4 or higher (Dancougar and Raideen) 

Saved Characters In Trial Mode:
Finish the story mode and save the game. Load back your saved file, 
after waith the endings run off. Start a new game, and select trial mode.
All characters unlocked, and you can play with the saved characters.