faviconic is a tool for running games inside your tab bar. Here's pong running inside 240 tabs.
The code is awful, sorry, I never really left prototype mode on this one.
To run (mac only):
Navigate to the directory
Run a local python http server (python -mhttp.server)
Edit baseUrL in script.os to point at the location of pong.html on your machine
Run osascript script.os to open a ton of chrome windows
Play pong