The Rule BookThe Building Blocks of Games Series: Playful Thinking How games are built on the foundations of rules, and how rulesof which there are only five kindsreally work. Board games to sports, digital games to party games, gambling to role playing games. They all share one thing in common: rules. Indeed, rules are the one and only thing game scholars agree is central to games. But what, in fact, are rules? In The Rule Book, Jaakko Stenros and Markus Montola