Beyond All Reason is a large open-source RTS probably best known for supporting matches with 100+ players in the same map. Unlike traditional RTSes, the default game mode is 8v8. I first became interested in the game as a player, and eventually ended up contributing to it.

I built an asymmetric 8v8 map, Pyroclast, which was accepted into the official map pool. Players have loaded it up 2,000 (and counting!) times. It's tricky designing for so many players, and I spent a lot of time iterating on making the map fun for players of all skill levels. The map is built with "roles" that vary in impact and skill level so that players can customize their experience to their desired level of difficulty and playstyle.

It's been a very rewarding experience to contribute to a game I'm an active player of.