ShapeOmetry is a fun way to develop spatial, abstract and quantitative reasoning skills. To solve the puzzle challenges, stack green pieces on top of blue pieces, or vice versa, to create identical shapes. Through hands-on play, players build key skills, strategies and mathematical understandings, such as part-to-whole relationships. The ThinkFun ShapeOmetry Features: 10 Blue Puzzle Pieces 10 Green Puzzle Pieces 50 Ringed Challenge Cards with Solutions Learning Guide Game-Go Bag.