This was a huge hit with my kids...they've been playing for hours!!

This is a fantastic version- great new pieces. Don’t let the bad reviews deter you - this toy is free play, the kid should design and build whatever their hearts desire. If you want to copy the example included they expect you to build in sections, not bottom to top. Build bottom and the top ten or so parts and the middle ten or so and put together otherwise it will never stay up. That’s not really how these toys work though, just free play and improvise. My son has been into to marble runs for three years - trust me

My two 5 year olds love it and can even mostly put it together themselves. They got it for a birthday gift and it’s been great! They asked to play more and skip their tv time.