From the Author:
Speed across up to five phones and tablets. No apps. No downloads. Just Chrome and the web. Visit g.co/racer on your phone or tablet and build a racetrack across multiple screens. To accelerate, touch your screen. But watch out for the corners, go to fast and you’ll fly off the track.
Ready? Start your engines.
HTML5 Canvas, Paper.js, WebSockets, Web Audio API, Go, Google App Engine, Google Compute Engine.