http://gamasutra.com/blogs/EricZimmerman/20140811/223107/How_I_Teach_Game_Design_Lesson_2_Broken_games_and_meaningful_play.php
http://gamasutra.com/blogs/EricZimmerman/20140811/223107/How_I_Teach_Game_Design_Lesson_2_Broken_games_and_meaningful_play.php