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Working Systematically - Short Problems
A collection of short Stage 3 and 4 problems on Working Systematically.
Working systematically
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articleCorresponding Sudokus
This second Sudoku article discusses "Corresponding Sudokus" which are pairs of Sudokus with terms that can be matched using a substitution rule.
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articleImpuzzable
This is about a fiendishly difficult jigsaw and how to solve it using a computer program.