Hi GameDevMix,
- To get my same placing of the stairs and the desk you have to overlap the border tile of the desk on a different layer
- The red carpet was indeed missing that corner tiles, I added them to it and the others with today's update, in the new "Room_Builder" file! here
- All the elevator stuff got revamped some weeks ago (here) and that border was removed due to animation issues. I added it back to the files so you can still use it even if it doesn't have a related animation!
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Comment again if you encounter any other issue, I'll solve it asap :)