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The Guardian - UK
The Guardian - UK
Lifestyle

Are sudokus and kakuros made by people or computers?

Sudoku … computer-generated, or hand-crafted?
Sudoku … computer-generated, or hand-crafted? Photograph: Iain Masterton/Alamy

Are number puzzles (sudoko, kakuro, etc) created by man or machine (ie computer) and, in particular, how are the (sometimes rather questionable) difficulty ratings created?

Ian Tanner, Market Deeping, Peterborough

• Post your answers – and new questions – below or email them to nq@theguardian.com. Please include name, address and phone number.

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