If you want to make this easy, use https://github.com/socketstream/socketstream https://github.com/socketstream/socketstream. Great progress is being made on th

If you want to make this easy, use https://github.com/socketstream/socketstream https://github.com/socketstream/socketstream. Great progress is being made on the 0.3 version and it makes pub/sub broadcasting and message pushing very easy. You wouldn't be the first person to make a live multiplayer HTML5 game with it: https://github.com/alz/socketracer https://github.com/alz/socketracer.