Quadruple Sudoku
In quadruple sudoku, a circle sits at the corner point where four cells meet; the digits in that circle must appear somewhere among those four cells (position unspecified).
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Quadruple Sudoku rules
- 1Rule 1
The classic row, column, and 3x3 box rules apply as usual.
- 2Rule 2
The circle where four cells meet lists digits that appear among those four cells.
- 3Rule 3
Which of the four cells holds which digit isn't specified — only that all of them appear somewhere.
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