Easy Non-Consecutive Sudoku

No two adjacent cells may contain consecutive digits. This global constraint ripples across the board, dramatically cutting candidates. Free online.

Easy Medium Hard Expert

New to Non-Consecutive Sudoku? Adjacent cells cannot hold consecutive digits — if a cell has 5, its neighbours must avoid 4 and 6. Start here.

4
5
3
7
6
3
5
6
2
4
2
7
4
8
5
9
9
6
2
4
3
3
8
2
1
7
1
4
8
3
6
4
3
9
6
2
7
6
Mistakes
0/3
Score
-
Time
00:00
Try Medium Non-Consecutive Sudoku →
Progress0%

What is Non-Consecutive Sudoku?

Difficulty
★★★☆☆
3/5
Constraint Type
Anti-Constraints
Typical Givens
18–24
Avg. Solve (Easy)
5 min

Solving Techniques for Easy Level

Technique Description Level
Global Candidate Pruning For every filled cell, remove its ±1 neighbours from all orthogonally adjacent cells immediately. Beginner

Ready to go deeper? Try Medium Non-Consecutive Sudoku to unlock Intermediate techniques.

Techniques to Master at Easy

  • Last Possible Number technique — Every neighbouring digit deletes two candidates (its +1 and −1) from a cell, so cells beside two or three givens often collapse to a single legal digit immediately.
  • Notes in Sudoku — After each placement, strip n−1 and n+1 from all four orthogonal neighbours before doing anything else — stale notes are fatal when the constraint is global.

Average Solve Time by Difficulty

Easy
5 min
Medium
13 min
Hard
26 min
Expert
48 min
Want a full walkthrough of rules, strategies, and solving steps? How to Play Non-Consecutive Sudoku →

Related Variants

Consecutive Sudoku

The marked counterpart of your global rule — bars show exactly where consecutive neighbours sit, and absence means what you're used to.

Anti-Consecutive Sudoku

The same global neighbour restriction under its other name — an alternative puzzle pool built on identical logic.

Anti-Knight Sudoku

Another unmarked anti-rule, pushing the forbidden relationship from orthogonal neighbours out to knight-move cells.

Frequently Asked Questions — Easy Non-Consecutive Sudoku

What is Non-Consecutive Sudoku?
Non-Consecutive Sudoku adds one extra rule to standard Sudoku: no two orthogonally adjacent cells (cells sharing an edge — not diagonals) may contain consecutive digits. If a cell holds 5, all four of its neighbours must avoid both 4 and 6. All standard Sudoku rules for rows, columns, and 3×3 boxes still apply.
What does 'non-consecutive' mean in Sudoku?
Two digits are consecutive if they differ by exactly 1 — for example, 3 and 4, or 7 and 8. The non-consecutive rule forbids placing such pairs in cells that share an edge. Diagonal neighbours are not affected. Only the cells directly above, below, left, and right of a given cell must avoid consecutive values.
How do I use the non-consecutive rule when solving?
Pick a cell that has a known or narrowed-down value and check its four edge-neighbours. Each neighbour cannot hold a digit one higher or one lower. For example, if a cell holds 1, its neighbours cannot hold 2 (1 has no lower neighbour). If a cell holds 5, its neighbours cannot hold 4 or 6. This quickly eliminates candidates.
What is the easiest way to start an easy Non-Consecutive Sudoku?
Start with standard row and column scanning to place any obvious singles. Then apply the non-consecutive rule to eliminate additional candidates from the neighbours of newly placed digits. On easy puzzles, these two techniques together fill the board quickly without needing pencil marks.
Is Non-Consecutive Sudoku harder than regular Sudoku?
Easy Non-Consecutive Sudoku is actually often easier than standard easy Sudoku, because the extra rule eliminates candidates aggressively. Knowing that a cell holds 5 immediately removes 4 and 6 from four neighbours, providing far more information than a standard given. Medium and hard difficulties become progressively more demanding.

More questions? See the full Non-Consecutive Sudoku guide.