The 3-in-1 Techno Gears Marble Mania Twin Twister 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 that encourages thinking and learning, challenges problem-solving skills, and expands knowledge of mechanics and engineering. Requires 2 AA batteries (not included).