Check out BlockTanks, a simple yet addicting MMO Tank Game made with nodeJS and Websockets.
In BlockTanks, you move a tank and shoot players on the opposite team, getting as many kills as you can. No need to create an account, just type in a name and play!
The game's features include:
Real time player combat
A maze-like map that two teams of tanks can navigate through
Three types of power-ups
Play the game at: blocktanks.us.to
Hope you like it!