Rub-a-dub-dub, let's use our brains in the tub! These 3D puzzles are more than just cute, they're great for problem solving and motor skill development. With a little ingenuity the shapes fit together into five different sea animals. Plus they don't absorb water so there's no chance of icky mold or mildew build-up. Tub time that hones mental acuity. Now that's smarty-pants.