A NEW TYPE OF PUZZLE discovered in the ancient Mayan Pyramids of México, it is a puzzle using only Arabic Numbers. We bring you the 7 X 7 version. There are 165 puzzles and solutions in this Volume 113. Learn what the Mayan's knew long ago about teaching the brain to develop a quick positive response. This set of puzzle games will help to put math in a positive light for any age group. It will teach you Problem Solving. It helps in the following areas: Memory, Attention, Focus, Speed, Visual Perception, Spatial Reasoning, Managing Stress, and Rapid Reaction Time, (RRT). TUNE UP YOUR BRAIN, TODAY! We also have these books as apps at this link, click here.