I wrote a short piece in the latest version of MAKE (the digital version will be available when the next version comes out). It documents an open source ball game that my friends at Platial were involved in creating. This is an actual outdoor game played with actual balls...nothing digital involved, other than the rules Wiki. Here's a sample of the piece:
They started playing standard kickball on the bocce court, but quickly had to modify the traditional rules. The bocce court was too small for there to be three bases, so they appropriated cricket's two-base system (but kept kickball's baseball-inspired system of strikes, outs and innings). From soccer, they borrowed the idea of throwing the ball back in when it goes out of bounds, and that led another important change. As Wilson says, "you can [really] bean somebody," when you throw a ball in the close quarters of the bocce court, so they introduced rules from dodgeball.
Borrowing ideas and adapting the rules became part of playing the game. With spring, bocce season started and the courts were in use on the weekends, but the bank drive-through wasn't, so it became a legitimate court and the rules changed again to accommodate it. As Wilson puts it, "It was never declared that it was going to have a collaborative rulemaking process, but that's what it was."
The rest of the issue, which focuses on games and toys, is pretty entertaining. Get your copy at the newsstand.