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.