This is a sub-page of The Legend of Zelda: The Wind Waker/Unused Rooms.
The Wind Waker actually has more unused areas than the number of islands on the Great Sea. The total number of such areas found (so far) is 55 and, while a large number of them are test rooms, there are some early maps in here as well. This list is organized alphabetically by the areas' internal names, split into four pages because there's a lot of stuff here.
Page TwoSooooo many test rooms that we can barely fit them on one page.
Page FourThe Tower of the Gods was redesigned during development?