Just finished a Wasgij (Jigsaw back to front). A Wasgij puzzle is one where the image on the box is NOT the image of the jigsaw. The jigsaw is a connected image but not the same. This means that you have only a small number of clues as to how the puzzle goes together.
I have been doing "Commuting Chaos" over the last few days and, whilst challenging, was great fun.