This logical road builder puzzle set offers 206 challenging road-building puzzles designed to help children ages 3-8 develop focus, observation, exploration, recognition, creativity, concentration, and comprehensive problem-solving abilities. The enlarged base board allows kids to design intricate routes and build scenes, and the set is compatible with most common building blocks for expanded play possibilities. Made from safe ABS material, this educational STEM toy provides step-by-step upgraded logical thinking training through engaging, hands-on play. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.