Experience the magic of marbles rolling on invisible slopes with the Fat Brain Trestle Tracks Builder Set! This 73-piece set includes stacking cubes, flat tracks, and stainless steel marbles that glide smoothly along widening paths. Build guided designs or create your own exciting marble runs. It’s a fun way to boost creativity, problem-solving, and engineering skills. Durable and compatible with other sets, it’s perfect for endless play and discovery! Ages 8+