Ten years ago, multiplayer-only games went through a severe identity crisis. More people than ever were gaming together, but they were increasingly playing online only. The small-stakes joy of twitchy experiences like Street Fighter II and Super Off Road, games meant to be played in short sessions preferably in the same room, weren't feasible anymore. Video games have always been expensive to make, so multiplayer modes had to either come packaged with other content -- consider Halo's famed multiplayer tucked alongside its single-player story -- to flesh them out or be custom built to serve hardcore players meeting up on the internet, a la Team Fortress 2, Valve's modern-day equivalent to the easy-access multiplayer of yore.
With both game making and publishing getting easier, cheaper, and more accessible for even the smallest developer, though, arcade-style multiplayer games have made a massive comeback. Making them is no easy feat, though! Engadget picked the brains of nine small developers responsible for some of the brightest, most unusual multiplayer video games out right now and asked about the biggest challenges in making games for more than one person to play.