1337 Pieces Marble Run Set Toys with 3 Steel Balls Glow in The Dark, Marble Maze Game Marble Roller Coaster Kit Educational Learning Building Blocks for Children

This is fun and a great way to teach kids about a number of things, mostly how to follow directions. Some parts are plastic and will break, it's easy to make it wabble, but it's Fun! The key is to make some minor adjustments as you go along. Ball speed can make a big difference on the track. I have put two tracks together already. Now I'm going to put the two tracks together. Also, just FYI, the level 9 needs to be modified to a degree. It is fun getting it to work as intended.

This set is massive. I love the size of it. Space Rail is notoriously challenging to assemble and to get the marbles to successfully navigate the course. I was aware of this when purchasing the set. The pieces are very fragile and I broke several of them trying to put it together. The set only comes with a handful of extra pieces, not enough for me to finish so I will have to order more to finish. But I still love the set and would recommend it to anyone 14 years of age or older that has exceptional patience.

This spacerail is the penultimate challenge, if you thought level 9 was hard, well, lets just say what Sans from undertale said"You're gonna have a bad time