Credits:

Invis

How To

You will need several things correctly set to make this work:

1) You need the correct movement permission for the tiles that you use.

In short explained: 00 cross layers resets the elevation where you are on next, so you will always have to use those on your stairs both before entering or leaving the higher elevation. ( I mentioned that because in my screenshot you can only see one pair of stairs but the stairs that are further up have 00- cross layers as well as movement permission.

2) You have to set the "Layer" of the block to normal.

3) You have to set the "Behavior" of the block to "Cave".

4) The tiles that you use to create your block are only allowed to be placed into the "Foreground" of the block. The "Background" has to be filled with transparency color.

Happy Hacking!