Sudoku 6×6 Solver
Fill each row, column, and 2×3 box with the digits 1–6. A great stepping stone between Mini and Classic Sudoku.
or generate a puzzle to get started
About 6×6 Sudoku
The 6×6 Sudoku uses a grid of 36 cells divided into six 2×3 rectangular boxes. Every row, column, and box must contain each of the digits 1–6 exactly once.
The 6×6 size is popular in schools and puzzle books as an intermediate step between the 4×4 Mini and the full 9×9 Classic Sudoku.
Frequently Asked Questions
What makes 6×6 Sudoku different?
The boxes are 2×3 rectangles instead of squares, and only digits 1–6 are used.
Is the solving logic the same as 9×9?
Yes — the same techniques apply: scanning, elimination, and naked singles.
Can kids solve 6×6 Sudoku?
Absolutely. The 6×6 format is well-suited to ages 8 and up.
How to Play Sudoku 6×6
1 Rules
- ✓ Fill every row with the digits 1–6, no repeats.
- ✓ Fill every column with the digits 1–6, no repeats.
- ✓ Fill every 2×3 rectangular box with the digits 1–6, no repeats.
- ✓ Pre-filled clue cells cannot be changed.
2 Strategies
- 💡 Box Shape Awareness: The 2×3 boxes span 2 rows and 3 columns — one given digit often immediately pins down where it must go in the other row of that box.
- 💡 Row–Column Cross-Check: With only 6 symbols, listing the 2–3 missing from any row and matching them against column constraints narrows candidates very quickly.
- 💡 Naked Singles First: In 6×6 puzzles, naked singles (cells with exactly one candidate) appear far more often than in 9×9 — always scan for them before trying harder techniques.
Tip: The 2×3 boxes are asymmetric — always apply both their horizontal and vertical constraints together. Most 6×6 cells yield to simple scanning without any guessing.