I'd add: - Rules of Play http://mitpress.mit.edu/books/rules-play http://mitpress.mit.edu/books/rules-play - Challenges for Game Designers http://books.google.

I'd add: - Rules of Play http://mitpress.mit.edu/books/rules-play http://mitpress.mit.edu/books/rules-play - Challenges for Game Designers http://books.google.com/books/about/Challenges_for_Game_Designers.html?id=wzAJLwAACAAJ http://books.google.com/books/about/Challenges_for_Game_Desi... - The Art of Game Design http://artofgamedesign.com/ http://artofgamedesign.com/