File Management
Here are some links to the places where you may need to go while making levels.
Construction Kit 3 This is where Construction Kit 3 saves its levels.
Compiled Folder Compiled games go in here.
Multiplayer levels Multiplayer levels in here will be detected by the multiplayer mode
Files from Construction Kit 3 and Multiplayer and the compiled games can be easily transferred between players by copying the files from these places or placing new files here.