Variant Sudoku

Non-Consecutive Sudoku Explained in One Short Example

0:15 · Non-consecutive · Variant Sudoku

Three cells in a row show the non-consecutive rule. 4 and 5 side by side break it, and 4, 7, 2 passes because no neighbors are one apart.

Full lesson and practiceFind Non-Consecutive puzzles

Transcript

  1. 0:02Cells side by side can’t hold consecutive digits.
  2. 0:064 and 5 are consecutive.
  3. 0:094, 7, 2: no neighbors are one apart.

The rule

Non-consecutive sudoku adds one rule to the whole grid. Two cells that share an edge can't hold digits that are one apart, such as 3 and 4. Cells that touch only at a corner are not affected.

The rule applies to every pair of neighbors, so it cuts candidates everywhere. Digits from 2 to 8 have two consecutive partners, and 1 and 9 have only one.

Worth memorizing

  1. A 5 rules out 4 and 6 in all four neighbors.

  2. Diagonal neighbors are fine.

Practice non-consecutive in the lesson

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