The ‘work’ is Window Pong, based on the classic game of Pong. You need to try it out to really get a feel for it but the idea is that the browser creates separate pop-up windows and you play against the computer. The computer volleys back a smaller window (as if it were a ball) and you use your keyboard or mouse to ensure you volley the “ball” straight back.
It’s clearly not going to be something which you’re going to want to play day in/day out but it’s definitely worth trying out and is a fantastic piece of JS by Vriens.
via webware / photo credit cnet
Read next: Steve Is Apple!