Arduboy a $40 credit-card-sized game system for playing and coding

This is cool. The Arduboy is an Arduino-based game system that makes it easy to program your own games on it.

Arduboy is an open platform for people to play, create and share games. A game system the size of a credit card. Choose your favorite classic game from the completely free Arduboy Arcade. Built on the popular Arduino software, it's also an excellent way to learn how to program! Because you can learn to make your own games, Arduboy is a game system the size of your imagination!