Easy Renban Sudoku

Digits on each purple line form a set of consecutive digits in any order. The line's length tells you the range.

Easy Medium Hard Expert

New to Renban Sudoku? Each purple line must contain consecutive digits in any order. Start with the shortest lines.

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

What is Renban Sudoku?

Difficulty
★★★★☆
4/5
Constraint Type
Line Constraints
Typical Givens
20–28
Avg. Solve (Easy)
10 min

Solving Techniques for Easy Level

Technique Description Level
Length-Based Range A Renban line of length L must contain L consecutive integers. The starting value is between 1 and 10−L, giving 10−L possible ranges. Beginner

Ready to go deeper? Try Medium Renban Sudoku to unlock Intermediate techniques.

Techniques to Master at Easy

  • Last Possible Number technique — A renban line of length L draws from only 10−L possible runs — fix one cell and every other line cell loses all candidates outside the surviving runs.
  • Notes in Sudoku — Note the possible runs beside each line (a 4-cell line: 1–4 up to 6–9), not per-cell candidates — updating one shared run list beats updating four cells.

Average Solve Time by Difficulty

Easy
10 min
Medium
22 min
Hard
42 min
Expert
72 min
Want a full walkthrough of rules, strategies, and solving steps? How to Play Renban Sudoku →

Related Variants

German Whispers

The mirror image of renban logic: lines that forbid close digits instead of requiring a consecutive run.

Palindrome Sudoku

Another line whose meaning is about the set of digits on it — here the line must read the same in both directions.

Between Lines Sudoku

Swaps the consecutive-run rule for a bounded-range rule anchored by two endpoint circles — kindred range reasoning.

Frequently Asked Questions — Easy Renban Sudoku

What is Renban Sudoku?
Renban Sudoku is a Sudoku variant where purple lines are drawn on the grid. Each purple line must contain a set of consecutive digits — the digits can appear in any order along the line, but together they must form an unbroken sequence of integers. Standard Sudoku rules apply throughout.
How do renban lines work?
If a renban line has 4 cells, those 4 cells must contain 4 consecutive digits in any order — for example 3, 6, 4, 5 (which is the sequence 3–6). The exact length of the line tells you exactly how many consecutive integers are needed.
Can digits repeat on a renban line?
No. Because renban lines require distinct consecutive integers, no digit can repeat on a single line. This is a stronger constraint than standard Sudoku uniqueness within the line itself.
How do I start solving easy Renban Sudoku?
Find the shortest renban lines first. A 2-cell line must hold two consecutive digits — that is a very restricted set of possibilities. Also look for lines whose cells share rows or columns with many given digits, since those given digits eliminate specific consecutives from consideration.
How is Renban Sudoku different from Thermo Sudoku?
Thermo Sudoku requires digits to strictly increase along a thermometer line from bulb to tip. Renban Sudoku requires a set of consecutive digits in any order — no direction is specified. The constraint is about what set of digits occupies the line, not their sequence along it.

More questions? See the full Renban Sudoku guide.