Frets on Fire Soccer Style
Watch as a group of soccer players play the freeware game Frets on Fire with a projection on a wall and their soccer balls. This game on the PC is played just like the game Guitar Hero.
A bunch of sensors hooked up to the game on PC detect when the balls hit their intended spot and register as a key played on the corresponding guitar frets.
Apart from the constant disruption from the sound of the balls bouncing around, it does looks quite interesting for a game to be played in such a manner.