- SMBX 1.0-1.3 (original Redigit's assemblies)
- LunaLUA-SMBX 1.3.0.x (hacked original Redigit's assemblies)
- Levels for SMBX-38A (aka 1.4.x, built from scratch by Chinese guy with 5438A38A nickname) should be published here: http://wohlsoft.ru/forum/viewforum.php?f=60
- Levels for SMBX2 should be published here: viewforum.php?f=90
Here a place for levels are compatible with the legacy engine.