Here is a puzzle to cheer up the first day back after the bank holiday here in the UK… a smileydoku!
The rules are as per standard sudoku, except that there are three additional regions. These are marked in grey and contain nine cells, and each must contain the numbers from 1 - 9 exactly once only. So the smile is not just symbolic here - it demarcates three additional regions of the puzzle.
See how long it takes you, hopefully once finished you will still be smiling rather than frowning! It is not too difficult, but you will need to use the additional regions to help you solve the puzzle.
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