GrätselBüchner wrote:you can't replace any scenery that comes after 30.
No, you can replace all sceneries
including scene 32. From scene 33 on, SMBX will crash, when they get replaced.
Also don't worry about any tiles / levels / paths, as you can replace them without any problem.
And about replacing the sceneries from 33 on, you can take the original scenery located in the SMBX "graphics"-folder, and make a backup-copy of them. Then replace them with the custom ones afterwards, startup SMBX then (if you do replace the original scenes while SMBX is open, it will still show the original ones, until you restart the editor), and you have all the sceneries visible.
The only drawback is, that you still see the hardcoded graphics in the scene selection.