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There are at least two sudoku variants that use inequalities. One is greater-than sudoku, in which there are traditionally no given numbers and less-than and greater-than symbols are placed between cells. Another more obscure variant is greater-than killer sudoku, in which inequalities are placed between groups of numbers, indicating that the sum of one group is greater than the sum of another. killersudokuonline.com is a great place to find both of these.

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17y ago

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