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Amgueddfa Llechi
Mae criw o bobl ifanc wedi eu 'carcharu'. Allan nhw ddod o hyd i'r allwedd gywir er mwyn dianc? A group of youngsters are trapped in the National Slate Musuem. Can they set themselves free?
Darllediad diwethaf
Gwen 12 Awst 2016
17:15