COLOURS is a CMYK colour gamut jigsaw puzzle of pieces. Each tile is an individual colour and the task is to place each colour exactly in relation. Cloudberries Skyline Puzzle | Bright Cityscape Piece Jigsaw Puzzles for Adults with Cool Neon Colors and Challenging Gradient Design | Hardest Jigsaw. Paris-based artist Clemens Habicht is aiming well beyond the shades of the rainbow with his aptly named Colors Puzzle. Perfect for the CMYK connoisseur.