Hape thinks that there is never a better time to instill the fun in numbers than when one is young, and their Numbers Puzzle is a great way to introduce numbers and basic arithmetic in a fun and colorful way. The Numbers Puzzle is a slim piece of Baltic Birch fashioned to fit twenty solid Maple numbers (1-20) in a rainbow of colors in addition to a plus sign, a minus sign, and an equals sign. It can be used to practice counting, color recognition, sorting, addition, and subtraction. The puzzle looks great in any playroom, but it always looks better when your little ones are using it to learn. For ages three years and up.