Enjoy playing with this circular puzzle with integrated rails for wind-up vehicles (no batteries required). The 48 piece cardboard floor puzzle with sea theme can be assembled as three individual rings or as a complete circle. A groove in the inner ring allows the wind-up boat to pass sea creatures and numbers one to 10, promoting number recognition and counting. The outer ring has a rail on which the wind-up school bus passes the letters of the alphabet and the images that begin with each letter. Sing along when the bus turns its rounds! This fun and educational puzzle and vehicle playset measures 27" in diameter when finished. When children are busy with floor puzzles, they refine their gross motor skills, improve their hand-eye coordination and strengthen their skills to solve problems. This high-quality puzzle from Melissa & Doug is an extraordinary gift for preschool and school age children who can play interactive and screen-free.