Hand engineer your own marble run course complete with stairstep lifter and drop system with lots of twists and turns. Stairs, long lanes, twists and other obstacles are all parts of the Marble Squad. If you put all the wooden pieces together properly with the help of step-by-step instruction, you can place your Marble at the top and enjoy the course of the Marble. You can make it a game with the whole family or your friends by taking turns to release a marble in the Marble Squad. Maybe a marble comes down a little faster than the rest. Full of elaborate mechanisms and small tricks, the precise gear design provides smooth transition from one element to another. This build makes for lots of fun and hours of enjoyment after completion. Precise laser-cut parts with fit together perfectly. Detailed pictorial instructions are included. This is a great build for teens through adult or as a partner project with younger kids SELF-ASSEMBLY: handcrafted Marble Run set based on real lift coaster, intricate system of cogs gears GAME GIFT: fantastic brain teaser best gift for all ages TWISTS TURNS: 233 wood pieces and 10 marbles, including a wheel lifter,a stair stepper,4 straight rails, trapdoors and a block track STEM: Learn principles of STEM, enjoy hands on fun EASY TO BUILD: precise pre-cut wood sheets, easy to assemble