Innovative Kids Green Start Wooden Puzzles: Tough Trucks (18Mos+) 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. Each bold and simple two-piece images sits in an individual well with strong visual support underneath. Sturdy, raised pieces are easy for little fingers to grasp.