Match these puzzle pairs to make mastering numbers as easy as 1, 2, 3. Colour pictures featuring familiar objects illustrate numbers 1-20, and the puzzles are self-correcting, which means that each piece has only one match that fits. That way, children four and up can play independently and learn all the while, making the toy easy-access and also mess-free. It is great for number recognition, counting, matching, colour recognition, sorting, and simple math skills. Kids can also use the pieces to tell stories or engage in other forms of imaginative play.