Yu-Gi-Oh! The Eternal Duelist Soul – Gameboy Advance

Yu-Gi-Oh! The Eternal Duelist Soul - Platform: Gameboy Advance

Unlock more duelists
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After you battle and beat Yu-Gi, Joey, Tea, Tristen and 
Backura twice you unlock Mai, Weevil, Rex, Mako and Espa. 
They are harder.