Innovative Kids Green Start Wooden Puzzles: Choo Choo (3Yrs+) Puzzle Packaged in a reusable carry-along storage case, these Earth-friendly puzzles are made with wood from sustainable forests. Created with the help of child-development experts, green start wooden puzzles exercise skills that prepare children for reading, math, problem solving and more. One big, central image is divided into 14 pieces with only black-line outlines underneath. This unique jigsaw is suitably challenging and accessible for little ones who are ready for multiple-piece jigsaws but are not quite ready to lose the tray support.