The 3 in 1 Techno Gears Marble Mania TwinTwister includes over 200 pieces and is an action-packed marble maze with multiple building options. Complete with colorful twists, turns and tracks, the set includes both a hand crank and a motorized gear lifter to take your marbles up to the top of the run for another exciting adventure. Enjoy even more fun by building the optional Corkscrew and Vortex 100+ piece sets as well! This is a great STEM educational product. Ages 8-14 years.