- SMBX 1.0-1.3 (original Redigit's assemblies)
- TheXTech (Modern C++ successor of Redigit's SMBX)
Note:
- Levels for SMBX-38A (aka 1.4.x, built from scratch by a Chinese guy with 5438A38A nickname) should be published here: http://wohlsoft.ru/forum/viewforum.php?f=60
- Levels for SMBX2 (and everything related to LunaLua-SMBX) should be published here: viewforum.php?f=90
Here is a place for levels that is compatible with the legacy engine.