JMBricklayer Electric Marble Run Building Kits with Motor, Harp Track Great Ball Contraption Roller Coaster Building Sets, Art Dynamic Display Model Office Room Decor, Creative Gifts Toys(1508 Pieces)

this is a fun and interesting marble run to build. its priced fair and the pieces fit together easy like they should. i already purchased another version of this marble run.

The directions are very difficult to follow and the parts are mixed up in about a dozen bags. I takes much longer to find a part than to put it together. Some Chinese based companies provide great instructions. this was just the opposite. The marbles were light plastic that di not work when the device was turned on. And, no extra parts were supplied, so at the end, you run out of critical parts. This product is a disaster.

After assembly, it never worked. The balls rarely made it up the ladder without falling off, flying off or simply getting jammed up. I am an experienced builder but this one was almost impossible to make work.