It’s color on a curve, and sure to be an interesting challenge! Part of our popular series, “Krypt Gradient” will test your color perception — the ability to distinguish between different hues. Each of the 631 pieces has been created by a hand-crafted, spiral-inspired cutter, resulting in unique cuts with many odd shapes. Without a traditional illustration and only subtle gradient transitions for direction, patience and focus are essential. Assemble this puzzle for many shades of colorful fun! This 631-piece jigsaw puzzle combines soothing gradient colors with clean-cut pieces and Ravensburger’s perfect interlocking fit for a most pleasurable puzzling experience! Our puzzles are crafted with an exclusive, extra-thick cardboard backing along with our superior, linen-structured paper, so the printed image is vibrant, crisp, and glare-free. Create memorable moments with Ravensburger premium puzzles! Fun for ages 14 and up! Finished puzzle measure approximately 27 x 20 inches (70 x 50 cm) when completed.