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Playstation 2 - Robot Regiment cheats

Go to the title screen and enter the following button combinations:
The sound will confirm the accepted codes.

Unlock full member mode
Hold L1 + R2 + L3, after press Start. 
or
Finish the game in story mode.

Unlock Gundam
Hold L1 + L2 + L3, after press Start. 
or
Finish the game in story mode.

Unlock Hyaku Shiki
Hold R1 + R2 + R3, after press Start. 
or
Finish the game in full member mode.

Unlovk Hard mode:
Hold R1 + L2 + R3, after press Start. 
or
Finish the game in full member mode.