Yellow Map Tiles?

[JackOfAllTirades]

Howdy all.

So I get what the blue rooms on the map are, and I get what the green rooms are, but what are yellow rooms?

[The Real HELLCAT]

Rooms marked yellow on the map have shops.

[Mint Vanilla]

If you press the Y button on the controller (K on the keyboard, or click on the ?) on the map screen, it'll bring up a legend that tells you all the different colored map tiles.