The Atari Arcade was among the most demanding projects because it required full multi-touch, multi-player support across modern browsers and devices. Most HTML5 games are available in isolation so the hardware and browser can be dedicated just to gameplay. But that's not how we envisioned a modern arcade - where users could gather, play the games, challenge their friends to high-score dominance, and earn achievements. So we had to rethink how we approached game development with a common set of tools.
Check out our best code here or get more details on http://atari.com/arcade/developers