Maybe you have already read my favorable review of Escher Mirrorkal which I posted HERE. After my highly positive experience with it, I did not think twice before purchasing Mona Lisa Mirrorkal - the second entry in the series. On pictures it looked even more stylish and more difficult, adding the already familiar mirrors twist to the classic Fifteen Slide Puzzle. Unfortunately, Mona Lisa Mirrorkal turned out to be a bit of a let down. The first thing which made bad impression is that the images on the little cubes you slide around are not properly stuck on their sides and are folded slightly towards the cubes' centers. This does not influence the gameplay, but it is visible and annoying. Also, the printed image of Mona Lisa is very dark, which makes the puzzle both frustrating to arrange and not very pleasant to look at when finished. Sliding the pieces can be a hassle as well. It is not always smooth and sometimes the little cubes get stuck midway. If we disregard the technical and design issues, the actual solving experience is decent. For me, the puzzle is somewhat simpler than Escher Mirrorkal, and unlike it, there is only one image available to arrange. Even though Mona Lisa Mirrorkal has its flaws, I think it is worth the purchase for its original concept alone.