Cy: Ar fore braf haf, Carys, y tywysydd penderfynol, ar y tu blaen.
En: On a fine summer's day, Carys, the determined guide, was at the forefront.

Cy: Roedd hi'n arwain grŵp o dwristiaid drwy Gastell Caerdydd.
En: She was leading a group of tourists through Cardiff Castle.

Cy: Roedd yr awyr yn glir, a'r haul yn tywynnu dros y cerrig hynafol.
En: The sky was clear, and the sun shone on the ancient stones.

Cy: Roedd Rhodri, twrist brwdfrydig, ymysg y grŵp.
En: Among the group was Rhodri, an enthusiastic tourist.

Cy: Roedd ganddo gyfrinach: roedd e'n dda iawn am ddatrys posau.
En: He had a secret: he was very good at solving puzzles.

Cy: "Ewch ymlaen i ddwnsiwn y castell," meddai Carys.
En: "Proceed to the castle dungeon," said Carys.

Cy: Seiniodd ei llais yn yr oergell i bawb.
En: Her voice echoed through the chill, reaching everyone.

Cy: Roedd pethau nhw'r dwnsiwn yn dywyll a llawn hud.
En: The dungeon was dark and full of magic.

Cy: Caeodd yr ysgafn drws tu ôl iddynt.
En: The heavy door closed behind them.

Cy: "Pa mor diddorol yw hyn!" medd Rhodri i'w hunan.
En: "How interesting is this!" Rhodri murmured to himself.

Cy: Ond yn sydyn, clywodd pawb clic mawr.
En: But suddenly, everyone heard a loud click.

Cy: Roedd y drws yn gaedig.
En: The door was locked.

Cy: Cyffroi digolledig ddod trwy'r grŵp.
En: Uneasy excitement spread through the group.

Cy: "Gwnewch yn dawel pawb," meddai Carys yn dawel.
En: "Stay calm everyone," Carys said quietly.

Cy: "Gallwn ni ddelio â hyn."
En: "We can deal with this."

Cy: Edrychodd i Rhodri.
En: She looked at Rhodri.

Cy: Roedd e'n edrych yn chwilfrydig.
En: He appeared curious.

Cy: "Rhodri, wyt ti'n dda am ddatrys posau, on'd wyt ti?" gofynnodd hi.
En: "Rhodri, you're good at solving puzzles, aren't you?" she asked.

Cy: Gwŷdd Rhodri.
En: Rhodri nodded.

Cy: Teimlai ychydig o ymfalchïol wrth gerdded ymlaen.
En: He felt a bit proud as he stepped forward.

Cy: "Byddwn yn trio," meddai o.
En: "I'll try," he said.

Cy: Cyd-dynodd Rhodri ag archwilio'r waliau.
En: Rhodri began examining the walls.

Cy: Canfu orchuddiad y waliau gyda symbolau a rhiciau wedi'u cysgodi dros amser.
En: He found that they were covered with symbols and engravings shaded by time.

Cy: "Edrychwch yma," meddai Rhodri.
En: "Look here," he said.

Cy: "Mae'n edrych fel pos."
En: "It looks like a puzzle."

Cy: Egniodd Carys a'i helpu drwyddo.
En: Carys lit up and helped him.

Cy: Gweithiwyd gyda chynghrair agor ffigyrau hynafol y gwenithfaen.
En: They worked together to decipher the ancient granite figures.

Cy: Gafaelodd Rhodri yn sigred a throdd dro wrth dro.
En: Rhodri carefully turned the key bit by bit.

Cy: Ar wahân i'w synnu, teimlodd cyffyrddiad clic yn y ddinas.
En: To his surprise, he felt a click in the mechanism.

Cy: Roedd y drws wedi agor!
En: The door had opened!

Cy: Crio daeth o'r grŵp.
En: Cheers erupted from the group.

Cy: "Da iawn, Rhodri!" meddai Carys.
En: "Well done, Rhodri!" said Carys.

Cy: Y ddau esgynodd y tu allan yn saff.
En: They both emerged safely outside.

Cy: Roedd y grŵp yn edrych arnynt mewn brafder.
En: The group looked at them admiringly.

Cy: Roedd y touroddwr wrth ei bodd.
En: The tour guide was delighted.

Cy: "Diolch," meddai Rhodri yn swrth.
En: "Thanks," Rhodri said shyly.

Cy: "Efallai... hoffet ti' bach o goffi gydâ fi un diwrnod?"
En: "Maybe... would you like to have some coffee with me someday?"

Cy: Chwarddodd Carys.
En: Carys laughed.

Cy: "Byddwn i wrth fy modd," meddai hi.
En: "I'd love that," she said.

Cy: Trwy'r profiad hwnnw, deallodd Carys bod gellir delio ag unrhyw siŵrwydd gyda help.
En: Through that experience, Carys realized that any challenge could be overcome with help.

Cy: Teimlodd Rhodri'n fwy hyderus am ei alluoedd i ddatrys posau.
En: Rhodri felt more confident in his puzzle-solving abilities.

Cy: Roedd y dydd yn mynd heibio, ond y coffi cyntaf? Roedd hynny'n stori newydd i ddechrau.
En: The day went by, but the first coffee? That was a new story to begin.