The Legend of Zelda: Majora's Mask/Skulltula houses

Oceanside Skulltula house
There are 30 gold skulltula scattered within the house. To enter, you need to bomb the wall open, head down the shaft, and hookshot to the entrance.

Skulltulas are located within crates, inside small and large urns, behind paintings, and in the rafters at the upper walls of a ceiling.

Your reward for clearing out the house on the first day is a Giant Wallet, which increases your rupee capacity to 500. Otherwise, you get 20 rupees.