GT Advance 3 – Pro Concept Racing – Gameboy Advance

GT Advance 3 - Pro Concept Racing - Platform: Gameboy Advance
       
All cars
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At the title screen, hold L + B and press Left. 

All tracks
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At the title screen, hold L + B and press Right. 

All tune ups
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At the title screen, hold L + B and press Up. 

Extra modes
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At the title screen, hold L + B and press Down.