The kids love this. Its interesting to see where the marbles go but its a pain in the neck to assemble. Took me 2½ hrs to put together, instructions are horrible, they are pictures no words. Theres a website that is suppose to help step by step but when I tried it, it wasn't working.Some of the pieces wouldn't fit properly and makes it lopsided until u can figure out how to stabilize it. Other then that, it does keep the kids busy and amazed. Especially because it glows in the dark, so are the marbles. Once it is assemble it is cool. Its 150 pieces, 2 packes of marbles one plastic n the other glass.( I believe its glass, its regular marbles) It does have an elevator that picks up the marbles. Requires 2 AA batteries. All electrical components work so it makes cooler with the flashing lights and noises.