Smart Start Puppy Up Choose the right number of puppies to match the number, and then balance them on the scale to see if you're right! STEM with multiple levels of play: number recognition, counting and addition! Includes 30 2-Sided Cards, 19 Puppies, 10 Numbers, Puppy Scale, Rules; no batteries required. Colors may vary. Play with the puppies, numbers and scale even when you're not playing the gameweigh other toys and objects! Because the scale is a toy, you must first level it with your hands, and when you let go it will stay if it's balanced, or one side will bottom out if not.