Botley® the Coding Robot Action Challenge Accessory SetBotley the Coding Robot Action Challenge Accessory Set Create STEM inspired obstacle courses with Botley the Coding Robot Action Challenge Set. Includes 41 pieces for 9 challenges full of falling dominos, rolling balls, and swinging hammers. Develop coding and physics skills in a fun, hands on way. Compatible with other Botley accessories for endless building possibilities. 40 piece accessory set challenges Botley with fun STEM inspired chain reaction