Even-Odd
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Even-Odd, or Odd-Even, is just like regular Sudoku but with shaded or colored squares which must contain either even or odd numbers according to the puzzle.
The names Sudoku 13579 and Sudoku 2468 are also used for these variants.
This variant can be generalized further by having multiple colors, with each colour indicating the possible set of digits that can go into the cell.
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