Slide and Seek Ball Run: Balls roll down and disappear into a wooden box—a fun lesson in object permanence. Bunnies in a Felt Burrow: Practice bilateral coordination and containment with a set of sweet furry friends. Circle of Friends Puzzle: A series of circles is the right challenge for your toddler at this stage. (I personally used a bit of double sided tape and cut photos of my family to fit inside this puzzle. My baby enjoyed finding us and her pets more than she liked seeing random faces. Because of this, though, the original images have signs of wear from the tape removal.) Suggested stage to introduce: 13-15 months Minimal signs of wear.