The Learning Journey Techno Gears Marble Mania, Catapult (100+ pcs) Techno Gears Marble Mania Mini Series is a great way to challenge your child's building skills and introduce them to the Techno Gears Marble Mania line The Catapult set includes over 100 pieces to build and create your own marble and gear run Once completed, the spring loaded shooter launches the marble to the top of the build where the track and the fun begins! All Techno Gears Marble Mania sets are interchangeable and will require a minimum of 1-2 hours of construction for completion For ages 6 and up