"This toy/computer is amazing! .... Not only is it fun to figure out the puzzles, but even when you are wrong you are still rewarded with the mesmerizing sight of the marble making its way through the board. In fact, I couldn't believe the sound that the gates produce when the marble goes through - it reminds me of a mechanical switch. Alan Turing would be proud! If you are going to get one toy or game this year - this is the one to get." - Paul H. | Upper Story