Hi, I need help with the auto tile G_Undulation01 (the one that makes a little ledge). I want to make it so when its on layer 2, I can walk on it of there is a staircase, but otherwise you can't walk on top. Also I want to make it so when it is on layer 3, I can walk "under" it without being able to walk on top of the layer 2 one (I want to make "secret" rooms with this auto tileset but when I can go under the layer 3 one, I can walk around on the layer 2 one as well.) If this is not possible please let me know

Can't you simply use different autotile slots with the same G_Undulation01 graphic? One of them would be impassable, the other one passable and the third one simply passable in certain directions.

I guess that would work, thanks. Time to make another tileset then with the autotiles I have on there.