Looking for a real challenge? Try Clemens Habicht's insane 1000-piece CMYK colour gamut puzzle. Not only you will have plenty of fun trying to put it together on a long winter evening, but also learn a lot about colours.
The puzzle, however childish it may seem at first, is actually a part of a larger project that explores the way we work with colours. According to the creator, it is easier to solve than traditional image-based puzzle, because people rely on their intuitive sense of colour. Each piece in the puzzle corresponds to one colour in the gamut.
As a result, placement of every piece of almost obvious as we intuitively see what is missing and where a certain piece belongs. It sounds very interesting and we do not doubt the satisfaction coming from solving the puzzle is enormous, but we are afraid the colourful jogsaw may drive you insane before that happens.
If you'd like to give it a shot anyway, you can buy the 1000-Colours puzzle here for less than $60.