Mae Nia a Cai yn dod o hyd i gêm GameBoy arbennig yn y gamlas. Ond mae pethau rhyfedd yn digwydd wrth iddyn nhw ddechrau ei chwarae. Maen nhw'n cael eu sugno i mewn iddi, a chyn bo hir mae Cai wedi diflannu. A fydd Nia'n llwyddo i'w achub? Neu a fydd y ddau ohonynt wedi'u dal yn gaeth am byth? Addasiad o Game Boy Reloaded.
Brother and sister Nia and Cai find an old GameBoy game in the canal. But it's like nothing else they've seen before; it sucks you inside the game. Cai vanishes and it's up to Nia to save him. Can she do it or will they both be trapped inside forever? A Welsh adaptation of Game Boy Reloaded.
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