Just follow the detailed instructions in the 24 doors of the Advent calendar. Press out the pre-cut pieces, assemble them, and marvel as your marble run takes shape step by step. Once your track is fully assembled, you can start a race using the marble lift on the neon-colored acceleration tracks. Enjoy endless fun as the marbles spin, tumble down steps, and zoom around the whirl cone before reaching the finish line. Which marble will win? Aspiring engineers will love the challenge of building the marble run. And once completed, the marble run stands an impressive 50 cm tall — you'll be proud to showcase your track.