How to Play Renzoku
Fill the grid with digits 1–N. Dots between adjacent cells indicate those two values are consecutive.
Try it now — Easy 6x6 →The Rules
- Fill the grid with digits 1–N so each row and column contains each digit exactly once
- A dot between two adjacent cells means those two values are consecutive (differ by exactly 1)
- Adjacent cells without a dot are guaranteed NOT to be consecutive
- Both the positive (dot) and negative (no-dot) constraints must be satisfied
Available in 3 sizes (5x5, 6x6, 7x7) and 3 difficulty levels (easy, normal, hard).
See It in Action
Fill digits so dot-connected pairs are consecutive — adjacent cells without a dot are not consecutive
How to Play
- Mark all dot-connected pairs and list which values are consecutive (e.g. 3–4, 5–6)
- Apply the negative constraint: no-dot adjacent cells cannot be consecutive — eliminate those pairs
- Use Latin-square rules: each digit appears exactly once per row and column
- Cross-reference dot chains and standard elimination until every cell is determined
Pro Tips
The negative constraint (no dot = not consecutive) is often more powerful than the dot constraint
1 and N have only one consecutive neighbour (2 and N-1) — they're the easiest starting points
Chains of consecutive dots force a sequence of ascending or descending values — determine direction from context
Frequently Asked Questions
What is Renzoku?
Renzoku is a Sudoku variant where dots between adjacent cells signal that those two numbers are consecutive (differ by 1). Cells without a dot between them are NOT consecutive.
Choose Your Challenge
Start with easy to learn the rules, then progress to harder difficulties.