6 years & up. Dive into the next iteration and make bigger polyhedra or a catapult. With 450 pieces and 21 fun maker projects, you'll have enough pieces to start inventing larger projects with your friends! Features: bring out the Inventor in you and start creating with this open-ended kit, experiment with different materials, combine pieces to create hinges, movable joints, and whatever you can imagine for unlimited fun. Kit can explore STEAM concepts.