Arweiniodd yr ymchwiliad Scooby Doo i mewn i dwnnel peryglus o dan y ddaear. Bydd yn rhaid iddi ddisgyn i'r gwaelod iawn mewn cart er mwyn cludo'r brîd ar hyd rheilffordd gul hanner aeddfed. Dewiswch yr eiliad pan fydd y ffordd fwyaf diogel a gadewch i ni ofyn am draffig.
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