Mewn 10 y gêm Ben Y Dyfais estron rhaid i gyson symud o gwmpas mewn mannau annisgwyl, mynd ar drywydd dyfais estron sydd yn angenrheidiol iawn i Ben 10. I ddod o hyd iddo, mae llawer o bosau i'w datrys drwy gymhwyso amrywiaeth o erthyglau a gwybodaeth gan bobl eraill.
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