PUZZLE of the YEAR for 2013!! 40 challenges from tutorial to practically impossible Cool Circuits really does live up to its name. COOL! Created by Harry L. Nelson and Hiroshi Yamamoto, this puzzle emphasizes spatial reasoning and abstract thinking. Lay down a puzzle card, solve the challenge by making a loop, and watch the board light up! Cool Circuits has 40 different challenges ranging from student to expert. Can you solve them all? Comes with light up board, 8 fluorescent, 3-D puzzle pieces and 40 challenge cards.