Edu Science Electro Challenge 125 Activity Set Engineer tons of fun and challenging games with Edu Science Electro Challenge 125 Activity Set, a Toys'R'Us exclusive! Your child will have a blast interacting and creating different electrical science projects. Activities range from a maze challenge and flying disk creation, to a color filter and a moving action dinosaur! With 125 activities included, your child will engineer plenty of adventures to pique their interest. Get started on your electrifying adventure today