This construction accessory kit works with Botley® and Botley® 2.0. (Robots are not included) This engaging set comes with a wrecking ball and movable crane attachment. Snap-on the bulldozer arms and your robot becomes a bulldozer. Code your robot to move the crates around and knock them down. Botley® Crashin’ Construction Challenge supports open-ended imaginative play that helps children boost their critical thinking, problem-solving, and other essential STEM skills. Set includes: 10 pieces.