40-PIECE NUMBER PUZZLE: The Melissa & Doug Self-Correcting Number Puzzles set features 40 wooden pieces with color pictures of familiar objects that illustrate numbers one through 20. EXCEPTIONAL DEVELOPMENTAL TOY: Our number puzzles are great for helping kids ages 4 and up learn matching and counting skills. WOODEN STORAGE BOX: For easy cleanup and convenient storage, this children’s number puzzles set can be stored in the included wooden storage box with slide-in lid. GIFT FOR AGES 4 AND UP: This puzzle set is a delightful gift for kids 4 to 6 years old. Add the Melissa & Doug 200 Wood Block Set to round out the hands-on play experience and to give kids an engaging option for screen-free entertainment.