Even-Odd Sudoku
Cells with a square must contain an even number and cells with a circle must contain an odd number.
Boards that contain the Even-Odd variant have squares and circles in some cells of the board.
Even-Odd rules: Cells with a square must contain an even number and cells with a circle must contain an odd number. Not all the cells of the boards are marked with squares and circles.
See image below for examples.
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