- Home: http://old.nklein.com/products/54321/
- State: mature, inactive since 2001
- Keyword: puzzle, 3D, content open
- Code language: C++
- Code license: Custom (a very simple copyleft see http://old.nklein.com/etc/copyright.php)
- Code dependency: libpng, SDL, zlib
- Assets license: Custom (see code license)
- Developer: Patrick Fleckenstein