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Can you solve GCHQ's Christmas card puzzle?
- DerekL 11y agoThis type of puzzle is called a “Nonogram”, and is known by many other names. They are often printed in puzzle magazines and books, and there are many computer implementations. I used to visit griddlers.net all of the time. Nintendo made the “Picross” series, including a 3D version for the DS. Also, solving them is an NP-complete problem.