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This puzzle type consists of a criss-cross-style grid with some letters pre-filled. There are exactly 26 unfilled spaces which need to be filled in using every letter of the alphabet once, forming words that have something in common. Some unfilled spaces have a number. A set of numbered spaces (possibly with repeats) below the grid uses the letters in the numbered grid spaces as a key, producing a final answer word or phrase.
MIT Mystery Hunt 2013 Alpha Sleuth