Odd / Even Sudoku
The rule: Circles are odd digits, squares are even digits.
Play unlimited Odd / Even puzzles free — every one generated with a unique solution, rated by the solving techniques it actually needs.
- Four difficulties, from gentle to expert
- Step-by-step hints that teach, not just tell
- Interactive lessons and a daily race
- Make and share your own puzzles
Odd / Even sudoku puzzles in the library
- Soft Odds and Evens — Sudoku·AD
- Soft Two Kinds — Sudoku·AD
- Soft Halves — Sudoku·AD
- Soft Parity — Sudoku·AD
- Gentle Two Kinds — Sudoku·AD
- Gentle Halves — Sudoku·AD
- Gentle Parity — Sudoku·AD
- Gentle Odds and Evens — Sudoku·AD