Medium 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

Non-Consecutive Sudoku at medium difficulty. Propagating the non-consecutive rule after every placement creates cascading eliminations that unlock the grid faster than standard Sudoku.

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

What is Non-Consecutive Sudoku?

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

Solving Techniques for Medium Level

Technique Description Level
Global Candidate Pruning For every filled cell, remove its ±1 neighbours from all orthogonally adjacent cells immediately. Beginner
Digit 5 is Most Constrained 5 cannot be adjacent to 4 or 6. Use this to restrict placement of 5 across the entire grid. Intermediate
Chain Propagation Placing a digit propagates constraints along rows and columns, often triggering a cascade of forced placements. Intermediate

Master these, then take on Hard Non-Consecutive Sudoku to learn Advanced techniques.

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 →

Frequently Asked Questions — Medium Non-Consecutive Sudoku

What techniques are most useful for medium Non-Consecutive Sudoku?
Medium puzzles reward systematic propagation of the non-consecutive rule after every placement. Each time you place a digit, immediately eliminate n−1 and n+1 from all four edge-neighbours. Then rescan those neighbours for new singles. Also look for cells restricted to only two candidates where the non-consecutive rule eliminates one, leaving a naked single.
How does the non-consecutive rule create 'forbidden pairs'?
Every pair of adjacent cells creates a forbidden pair constraint. If cell A can only hold {3, 4}, then its neighbour B cannot hold either 2, 3, 4, or 5 (the consecutive mates of 3 and 4). This is a 'consecutive exclusion zone' that often drastically cuts B's candidates — frequently to a single digit.
What is a consecutive exclusion chain?
A consecutive exclusion chain occurs when a placed digit eliminates a candidate from a neighbour, which in turn eliminates a candidate from the next neighbour, and so on. These chains can traverse several cells across a row or column. At medium difficulty, following two or three links in such a chain usually unlocks a batch of placements.
Are 1 and 9 special in Non-Consecutive Sudoku?
Yes — 1 has only one consecutive mate (2), and 9 has only one (8). This means cells containing 1 forbid 2 in four neighbours, and cells containing 9 forbid 8. When 1 or 9 is placed in a crowded area, the restricted neighbour effect is slightly weaker than for middle digits, but these extreme digits are also easier to place because fewer values are forbidden around them.
How long does a medium Non-Consecutive Sudoku take?
Most players finish medium Non-Consecutive Sudoku in 15–25 minutes. The extra rule speeds up candidate elimination significantly compared to standard Sudoku at the same difficulty, so medium puzzles feel satisfyingly fast once you build the habit of propagating the non-consecutive constraint immediately after each placement.

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