It uses node.js and socket.io in the back end, html/js/css front end. It works pretty well on ipad, and ok on iphone/android (wifi). Everyone plays in the same

It uses node.js and socket.io in the back end, html/js/css front end. It works pretty well on ipad, and ok on iphone/android (wifi). Everyone plays in the same 'room' - simply send your friends the url to play against them.