12×12 · Hard to evil
Sudoku 12×12
Twelve-digit sudoku for serious solvers.
12×12·00:00
What is sudoku 12×12?
Sudoku 12×12 expands the classic to a 144-cell grid with twelve digits (1–12) and 3-row × 4-column boxes. Big enough to feel like a marathon but small enough to finish in one sitting.
Rules
- Each row contains digits 1–12 exactly once.
- Each column contains digits 1–12 exactly once.
- Each 3×4 box contains digits 1–12 exactly once.
Tips
- Pencil marks are essential. Empty cells start with up to twelve candidates each.
- Boxes are rectangles, not squares. adjust your visual scanning.
- Pairs and triples become more powerful than in 9×9 because each group is larger.
Related variants
- Sudoku 16×16, Hexadecimal sudoku for marathon solvers.
- Samurai Sudoku, Five 9×9 sudokus joined at the corners. Solve them as one giant puzzle.
- Killer Sudoku, Sudoku meets killer-style arithmetic: every dotted region sums to its total.
- Classic sudoku for comparison
Sudoku 12×12 FAQ
How long does 12×12 sudoku take?
Around 25–60 minutes depending on difficulty. Faster than 16×16, longer than 9×9.
What digits does 12×12 use?
We use 1 through 12 (two-character cells). Some publications use 0–B in base 12 but we find the numbers easier to read.
Are 12×12 boxes squares?
No. they're 3 rows by 4 columns. That's the only rectangle that fits twelve cells while tiling 12×12 evenly.
Is 12×12 sudoku easier than 16×16?
Yes. The smaller candidate space means hidden singles and pairs appear more often.
Are 12×12 puzzles unique?
Yes. Uniqueness is verified during generation.