I had never done a 3-D puzzle before so I wasn't sure what I'd be in store for with this Lighthouse. I was very pleasantly surprised! Me, my wife and our two kids (ages 6 and 8) all helped and we were able to assemble it in about an hour. I was surprised at how incredibly sturdy the entire thing was upon completion, and the kids had a great time playing with it when it was done. The light actually lights up and from a distance looks like it is slowly turning. The assembly was a lot of fun as well, and I appreciated the numbered pieces in the back. It really allowed the kids to get involved without making it too difficult for them. I definitely look forward to more Ravensburfger 3-D puzzles!