Well, this is my entry for the November 2010 Project of the Month Contest. It is very simple and far less usefull than the others projects. The truth is that I wasn't participating until I saw the Chronos .So i had to come up with something easy and fast to develop. I was plaiyng arround with some leds and photodiodes in front of my pc monitor and I thought that cold be interesting to interact with the screen with the photodiodes or some other ligth sensor. that idea eventually ended up being a shooting game. I wasn't too sure what to shoot at but then i realized that the option was obvious;