Dodomai Palace

Dodomai Palace is a large palace and the residence of Duke Onkled. However, since Ganon took over Gamelon, the Palace has been over run with monsters and Duke Onkled has been sealed in his chambers. Hectan now has control of the Palace and has sealed away the Royal Retainer. Zelda starts outside of the castle, in a coastal forest, and must get inside the palace through its sewers. Once she does so, Zelda will be in the palace yard, and will have to get inside the castle through a great locked gate, which can be unlocked by using a key obtained from one of the Darknuts that guards the gate. Inside Dodomai Palace, the player will find several doors. The first one leads Zelda to a tower. The second third doors both take her to the library. The fourth and final door takes Zelda to a large hall filled with Deelers. After climbing the tower that the first door leads Zelda to, she will fight Hectan, in the top of the Castle, in a place filled with Armos. Aftet defeating Hectan, Zelda can get inside the prison, where the Royal Retainer was chained. Once he is freed by Zelda, he tells her that the key to Onkled's chamber is hiden in the portrait in the library. After striking the face of the portrait, the key is revealed and Zelda can get inside Duke Onkled's room. The duke is afraid of Zelda, begging her not to hurt him, and reveals the secret way into Reesong Palace and gives Zelda the key that opens the gate. Then, Nokani Forest becomes available.

Trivia

 * This is one of only two dungeons in the game that has a puzzle of any kind, the other being the Reesong Palace. Zelda must strike the portrait of Duke Onklet in order to get the key required to enter his chambers and complete the dungeon.
 * This is the last area that unlocks another area after its completion, which in this case is the Nokani Forest.