Even-Odd Sudoku - 200 Hard Puzzles 9x9 (Volume 4) by Dart Veider
10,91 €
Even-Odd Sudoku: fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Cells with gray circles must contain odd digits, cells with gray squares must contain even digits.
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