For game design, any or all of these will easily be in most top lists: - Tracy Fullerton's Game Design Workshop - Jesse Schell's Art of Game Design A Book of

For game design, any or all of these will easily be in most top lists: - Tracy Fullerton's Game Design Workshop - Jesse Schell's Art of Game Design A Book of Lenses - Steve Swink's Game Feel - Scott Rogers' Level Up - Skaff & others' Characteristics of Games - Raph Koster's A Theory of Fun - Joris Dormans & Ernest Adams' Game Mechanics: Advanced Game Design This one was just published but I'll happily bet on it: - Richard LeMarchand's A Playful Production Process