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åÊThis is a seriously creative puzzle ‰ÛÒ using putty of all things! The Intelligent Putty STEM Puzzle is the ultimate way to bring out your problem-solving skills. Get your putty stretching puzzles carried out with six different colors and puzzle trails to make it through. This is quite an involving puzzle, where snaking putty trails must make it to their goals. There are sixty beginner challenges for kids to solve before they get into the intermediate challenges.