I propose here to let you check, a little game that I developed when I was in Montreal for a challenge to myself: The snake game in multiplayer with HTML5 ! The initial project was under socket.IO before I decided to convert it in SignalR, the .NET library for real-time applications.
(I will publish the socket.IO version one day, here)
Download sources here : Ksnake (Code is really not the best, a lot of bad practices, but you know, when you're learning...)
Play with the online version: Knake en ligne (you can test it with two tabs open)
Something important, the server to test the game is a little bit slow....