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12×12
12×12 · Hard to evil

Sudoku 12×12

Twelve-digit sudoku for serious solvers.

12×12·00:00
About 12×12

What sudoku 12×12 feels like.

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

  1. Each row contains digits 1–12 exactly once.
  2. Each column contains digits 1–12 exactly once.
  3. Each 3×4 box contains digits 1–12 exactly once.
Key rule
Digits 1–12 in 3×4 boxes
Difficulty range
Hard to evil
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.

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.