Matthew Keeler remembers the first time he was hooked on playing games. "When my buddies I grew up with got a box of figurines, these fantasy figurines, sort of generic ‘Dungeons & Dragons’ stuff, ...

Most humans like games. But what are games, exactly? Not in a philosophical sense, but in the sense of “what exactly are their worky bits, so we know how to make them?” [Raph Koster] aims to answer ...