Just missing 1 of the red struts that go under the overpass (see photos). The cars will go under without the extra one but you could get more support by adding something extra. (A block or a piece of wood or anything put under the track will help). Includes extra Mario Yoshi Carrera car as a bonus. Cars work. They have been used so may need new brushes at some point. Box has significant wear. Takes 4 C batteries-not included.