# 54321 - Home: http://old.nklein.com/products/54321/ - State: mature, inactive since 2001 - Keywords: puzzle, open content - Code repository: @see-home - Code language: C++ - Code license: Custom (a very simple copyleft see http://old.nklein.com/etc/copyright.php) - Code dependencies: libpng, SDL, zlib - Assets license: Custom (see code license) - Developer: Patrick Fleckenstein Five classic two-dimensional puzzle games extended into three and four dimensions. ## Building