Since the class wasn't full, the moms got to get involved and I WAS THRILLED to complete the cube! I've never been able to do this before! (And, I didn't have any hints... we just started with simpler puzzles and I figured it out. I really felt as excited as a kid to figure this out!)
I also completed some other neat puzzles - I think this was called the chair.
You can either make your own puzzle pieces using small wooden blocks, or you can buy a set. There are lots of sites online where you can find photos of puzzles to put together, like at this site. So, now I'm planning on making a set... or finding a set so we can play at home.