Adult supervision recommended
As an adult I found this one hard (the neice I was doing with this had less issue, but she's pulling straight As in chemistry, and I barely passed). I think it's challenging. I would definitely recommend adult supervision. That said, she loved it. She's also convinced she'll be a chemist when she grows up, so I'm not sure if she's the better gauge of how hard this is or I am. In any case, it's well-prepared, lots of instructions, and very educational. I learned a lot at least.