This puzzle is unique and very cool! It is challenging because the pieces don't lock in place. Instead, they slide together. It was a bit difficult to keep the shape while working on it but that was part of the challenge. Luckily the lid has a stand and shows the pieces in detail. (Suggestion: use the many player pieces as your anchors.) Also, if you plan to seal it, you should put it together on cardboard. I tried (by myself) to slide it onto one and it fell apart b/c of the non-interlocking na...