sudokly
45
9×9 · Medium to evil

Consecutive Sudoku

Classic sudoku with markers showing which adjacent cells differ by exactly one.

Medium00:00✕ 0
About consecutive

What consecutive sudoku feels like.

Consecutive sudoku adds inline markers. usually small dots or bars. between adjacent cells whose digits differ by exactly one. Sudokly uses the marked-pairs version: every dotted pair is guaranteed consecutive, while pairs without a dot carry no constraint. those chains of dots are powerful elimination tools.

Rules

  1. Standard 9×9 sudoku rules apply.
  2. A marker between two adjacent cells means the digits in those cells differ by exactly 1 (e.g. 4 next to 3 or 4 next to 5).
  3. Cells without a marker between them carry no extra constraint. their digits may or may not be consecutive.
Key rule
Markers between cells whose digits differ by 1
Difficulty range
Medium to evil
Tips
  • Marked pairs strongly constrain candidate sets. start with chains of three or more markers.
  • A marker forces one cell's value to be exactly one more or one less than its neighbour.
  • Pencil marks make consecutive sudoku much more solvable.

Consecutive Sudoku FAQ

What does the marker mean exactly?

It means the two adjacent cells contain consecutive digits. values that differ by 1.

Do unmarked adjacent cells have any constraint?

No. In our version an absent marker carries no information. the two digits may or may not be consecutive. Only the dotted pairs are guaranteed consecutive.

Sudokly uses which variant?

We use the marked-pairs variant: a dot guarantees the two cells are consecutive, but unmarked pairs are unconstrained. It keeps the puzzle approachable while the dotted chains still drive the logic.

Are markers shown on all four sides of each cell?

Only between adjacent cells in the same row or column. diagonal neighbours are not marked.

Is consecutive sudoku harder than classic?

Roughly the same difficulty at the same clue count, but it solves very differently because the chain logic dominates.