K&rsquo;NEX Thrill Rides &ndash; Big Ball Factory Building Set &ndash; 3152 Pieces &ndash; Ages 12+ Engineering Educational Toy WITH 3,152 ASSORTED PIECES  The Big Ball Factory Building Set by KNEX contains over 3,000 classic pieces to build structures on your own. This educational toy encourages your children to play and work at the same time, learning to find and fix structural problems. Its real-world engineering experience with instant rewards! Packaging may vary. BATTERY-POWERED  Marvel at this classic construction set, now updated with motor control! Just turn on the fully built model and watch as the balls travel down five different paths. The battery-powered automation means that difficult hand-cranking is a thing of the past. TWO-IN-ONE MODEL  This building set, marking its 20th anniversary, returns along with another nostalgic model that can be built from the same setthe Ferris wheel! Your children can build an entire theme park at home. Models can be built one at a time. EASY-TO-FOLLOW INSTRUCTIONS  Step-by-step instructions are included in the package. STEAMagination  Its the connection of STEAM (science, technology, engineering, arts & math) with a childs natural curiosity and creativity and it powers the fun of each and every KNEX building set. Building with KNEX puts children on a path towards a fundamental understanding of STEAM/STEM subjects. THRILL OF THE BUILD  KNEX Thrill Rides allows each child to build bigger models that move to create an amusement park right in their home! Using the included parts and pieces, each KNEX Thrill Rides building set you can build a massive roller coaster, a majestic spinning Ferris Wheel and more  the heart pounding fun is only limited by your imagination. DEVELOPMENT BENEFITS  KNEX supports key areas of a childs developmental growth. As they click the different parts together and discover how the building system works, theyre strengthening hand-eye coordination, fine motor skills, problem-solving skills, spatial awareness and exercising their imagination! PARTS GUARANTEE  Broken part? Missing part? If you find yourself in need of a replacement for any reason, just give us a call! Well get you what you need so that your child can get back to building as soon as possible.