The Art of Game Design: A Deck of Lenses by Jesse Schell (2008) Cards

Companion to the acclaimed book "The art of game design: a book of lenses" this convenient deck contains 100 unique "lens cards" each featuring key questions that will make your game great, and a magnificent color illustration to help you remember each principle. The lenses span every aspect of game design - story, game mechanics, technology, aesthetics, psychology, creativity, teamwork, playtesting, and even business issues.