Set of 15 pieces includes 2-piece catapult, 2-piece target hoop, 2 launch balls, 2-piece target funnel, 1 goal cup, set of decorative stickers, and set of 5 challenge cards. Kid-powered catapult: no batteries, springs, or rubber bands. Encourages trial and error approach to problem solving through game-like challenges. Early introduction to concepts such as angles, trajectories, and distances. Hoop target, when constructed, stands approximately 12" tall.