ZOOB Builderz Deluxe S.T.E.M Challenge Design and build cool, wacky creations Solve challenges, such as hitting targets and making balls bounce Build a catapult, zip line, trampoline and more Includes 255 ZOOB pieces, 2 foam building pads, 4 wheels with tires, 1 Rubber Ball, 1 nylon string, 23 rubber bands, and 14 challenge cards Recommended for children 6 years of age and older