The Ravensburger Krypt Gradient puzzle presents a special challenge for all puzzle fans. Instead of a classic picture motif, this puzzle features a smoothly flowing color transition that extends across a broad color spectrum. With 631 individually shaped puzzle pieces arranged in a spiral and circular structure, assembling it requires a high degree of concentration. The interplay of nuances from yellow, green, blue, and violet makes sorting and matching an exciting task. This demanding puzzle game is ideally suited for relaxing hours and trains the eye for the subtlest color differences.