THIS IS SO DIFFICULT TO ASSEMBLE. I felt like I was going to have an aneurysm just through the first few steps of assembly. Definitely not appropriate for a six year old unless they have the patience of a saint and thumbs of steel.

You can not see the letters and numbers to put together. The parts are not labeled so it's a guessing game of what is what. An hour and half in and we are on step 8 and it's not even right. Why put black grids and dark grey lettering?

Definitely not for 6 and up. As an adult, I found it difficult and gave up. It will be getting returned.

I really hope that the person who designed this isn’t moving onto roller coasters. I love Legos and puzzles but this was just NOT fun in anyway. It took me two days to get to Step 21 on Build 3 and I haven’t finished it even with being that close. If you want to know how skilled you are at maintaining patience, this is a good test but don’t be mad if you gift this to a kid and they start throwing stuff and cussing because it surely will push them as close to that point as a person can get. The images are too small the writing is even smaller, I found I had to count out the sections to make sure I had the right piece and was putting it in the right place. Tedious does not even describe the process.

The pieces do not stay together so the track is constantly coming apart during the build process. Each time we play using the marbles on the track they either get stuck between pieces that are coming apart, or gravitational pull to keep the marbles rolling, they come to a complete stop throughout the track. We tried build option 3 and 1, same issues and problems with each design. Also, it syas it's for 6+ ages, even though pieces are expected to be asembled in a ABC - 123 style grid, the grid is not labeled on the bases, we used a pencil to mark them. Don't waste your time or money on this dissapointing toy!

I would give it zero stars if that was an option. Don’t waste your money. The instructions are so tiny it makes it difficult to read and the quality of the parts is so poor. I spend hours with my 8 year old son trying to put this together and he lost complete interest, which I was thankful for because this is so poorly designed. Do not buy it even if it’s on clearance, it’s a complete waste of money.

My 6 year old was insistent that we figure out how to put this together. I like to think my husband and I are at least of average intelligence, but this thing is impossible. Hours of frustration ensued. Like the other review said best - "buy it if you hate yourself"

The instructions are HORRIBLE! None of the pieces are labeled. It is not worth it at all!! We will be returning ours!

Way to complicated. Was a total waste of money

If I could give it -10 stars I would. Complicated, poorly designed, and flimsy. Also didn’t even have the marbles (which are smaller than regular marbles) in the box, so can’t even use it. Spent hours putting it together. Please don’t waste your money. Lakeshore has a marble run that is much better and allows you to creat your own designs.