%0 Conference Paper
%B DiGRA \&\#3913 - Proceedings of the 2013 DiGRA International Conference: DeFragging Game Studies
%A Karhulahti Veli-Matti
%T Puzzle Is Not a Game! Basic Structures of Challenge
%@ ISSN 2342-9666
%D 2014
%2 http://www.digra.org/wp-content/uploads/digital-library/paper_179.pdf