A normal BZflag world is created by one designer. In the Collaborator Project, it takes 4.

The procedure: every project will start with a template map, which already has some basic infrastructure in place along the centre lines. Participating mappers will receive a copy of this, and each will be assigned a different quarter of the template to build upon.
Finished works are send back to me, afterwhich all 4 quarters are merged into one BZflag world file.

The result: original maps, and hopefully, a whole lot of fun to play!