Hyrule Castle

For The Legend of Zelda: A Link to the Past on the Super Nintendo (SNES).

Entrance: Hyrule Castle (Light World)

Pits

In 2 rooms here (B1), a pit takes one heart from Link in every mail and puts him back at the spot where he came into the room. Pits in the other rooms drop him to the floor below without hurting him.

From the official guides

Link slips into the castle from the courtyard. There are soldiers all through the castle, but they rarely spot you if you keep moving. Avoid pointless fights and press on.

ファミコン通信編集部責任編集ゼルダの伝説神々のトライフォースのすべてがわかる本 (アスキー, 1992), p. 22, translated by 101Leafy