This would make for a great game for whatever device you're carrying around in your pocket. It's just one of those annoyingly addicting puzzle games that are perfect for train rides and other situations that score equally low on the fun-o-meter.

The game screen is filled with colored balls and the goal is to get rid of as many of them as possible. You do this by clicking on groups of identical balls, where a group is any number of connected balls. Since Peter himself is color blind he added shapes to the balls as a supplement to the colors, making it easier to distinguish the different types. Nice idea.

Just like the game mechanics are simple, so is the implementation. The balls are made of small images that are simply moved around with a bit of JavaScript. There is no sound but a game like this doesn't really need it anyway.