I have always said that I like a challenge. Well this year for Christmas my daughter gave me the gift of a real challenge. This puzzle is wooden and has many very interesting pieces. Today while trying to recover from the flu, I turned the pieces over and sorted out what I thought were side pieces. I think I must have missed a few. I put these two pieces together and two more and now I am tired, so will rest, but I must say this will prove to be a real challenge! Thanks Jenn! : ) I will post a picture of it when it is finished.