Old School RuneScape uses the British convention for floor numbering: Ground floor, first floor, etc.
Wydin chathead

Wydin is the owner of Wydin's Food Store in Port Sarim. He sells a variety of fresh food. Wydin also plays a small part in the Pirate's Treasure quest; players must retrieve smuggled rum from a crate in his storeroom. To enter the storeroom players must be both an employee of Wydin's store, and wearing a white apron. There is an apron located in the storeroom, but unfortunately cannot be telegrabbed as there is a solid wall in the way. However, there is also an apron hanging in the nearby Gerrant's Fishy Business directly north.

It is suggested that Wydin lives in the store, as there is a bed on the 1st floor[?], above the ground floor[?].

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