Play Even/Odd Sudoku Online Free

Play Even/Odd Sudoku online for free. Shaded cells indicate whether the digit must be even or odd. Classic Sudoku rules apply.

▶ Play Even/Odd Sudoku — Free
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How to Play Even/Odd Sudoku

  1. Standard Sudoku rules apply.
  2. Circles mark cells that must contain even digits (2, 4, 6, 8).
  3. Squares mark cells that must contain odd digits (1, 3, 5, 7, 9).
  4. Unmarked cells can be either even or odd.
💡 Pro Tip
There are 5 odd digits and 4 even digits in 1-9. In any row with 4 even-marked cells, you know exactly which 4 digits go there.

Frequently Asked Questions

Are unmarked cells unrestricted?

Yes — cells with no circle or square can hold any digit 1-9. Only marked cells are forced to be even or odd.

How many even and odd digits are there in 1-9?

Four even digits (2, 4, 6, 8) and five odd digits (1, 3, 5, 7, 9). The asymmetry often helps narrow down candidates.

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▶ Play Even/Odd Sudoku