How do I make secret areas in the level editor?

[Tlaloc1]

So, I'm working on some levels, and I want to know how to reveal secret areas. (IE: The one at the end of the first level of Icy Island)

[Tobbi]

Create a new tilemap, set its name and use a Z value so that it covers the area you want to cover. So, it's gotta be more than the tilemap you wanna cover, put tiles on it, then reference its name in the secret area trigger (FadeTilemap). Done.

[brmbrmcar]

How on earth do you make a new tilemap in the in-game editor?

[Tobbi]

Tilemaps are in the ambient category.

[Tlaloc1]

Thanks for your help :]