Laser Command is a game which I build using a 8x8 matrix LED and an Arduino Mini. This game was developed as a "sample" class project for S10-05833 Gadgets, Sensors and Activity Recognition in HCI. The class is taught by Scott Hudson at Carnegie Mellon University, and I'm working as a TA for the class.
The most interesting part in this game is that the game uses a laser pointer as a two-dimensional input device in conjunction with a matrix LED. More information including circuit diagrams and source code is available on my web site.