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To introduce the Mathdokus, and to give a flavour of the kind of strategies that you may find useful, you may like to watch this video.
The last date for submitting solutions to the live problems is Monday 31 October.
problem
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5 by 5 Mathdokus
Can you use the clues to complete these 5 by 5 Mathematical Sudokus?
problem
Favourite
4 by 4 Mathdokus
Can you use the clues to complete these 4 by 4 Mathematical Sudokus?