To open the level editor, open Level Editor.exe (not leveleditorviewer.exe)
- Select entities by double-click, then left- or rightclick on them to move or rotate
- To save a file in the current directory, simply ignore typing path and type file name only (demo game requires a local *.lvl file)

Documentation can be found in the folder with the same name. The C# interface documentation can be found in Level Editor.xml, and the Nebula 3 (C++) documentation can be found in nebula3.chm -> Namespace List in Contents -> LevelEditor.

The how-to guide for implementing a level editor/tool is Framework implementation how-to.pdf.

demogame.exe enables interaction with created levels (it opens the first *.lvl file it finds)