You see there's nothing to see! Krypt Black 736-Piece Jigsaw is the ultimate puzzle challenge for puzzle enthusiasts. No image to puzzle. All pieces come in the same color. The secret is in the pattern of the puzzle cut! 736 pieces - no two are alike.Ravensburger has been making the world's finest puzzles for over 130 years in Germany. Ravensburger puzzles for adults are made to fit precisely - no matter how large or small the puzzle pieces. All Ravensburger jigsaw puzzles are precision-made so that every piece fits perfectly, without frustration. Best of all, every single piece in this puzzle is unique, no duplicates, for the perfect interlocking fit.Ravensburger uses extra thick, custom-developed European blue board and hand-crafted puzzle die cutting tools to prevent fraying or peeling puzzle pieces and dust.The finished size of of Krypt Black 736-Piece Jigsaw is 51 x 69 cm.