Use Laser pointer to play a LED board game.

The Laser Command by Eiji is a very brilliant project. He used arduino mini to build a complete LED board game, and just one 8x8 matrix led as the game output & also input device. Player can use a laser pointer to point to the led and start playing the game. The author website has a very good explanation of his project, it is worth to read if you are interested how to use LED as input : http://www.cs.cmu.edu/~ehayashi/projects/lasercommand/

Laser Command from Eiji Hayashi on Vimeo.