A LITTLE FOCUS. A FRESH START.
Play Renban Sudoku
Play Renban Sudoku free online. Purple lines hold consecutive sets in any order, with five difficulty levels and separate saved puzzles.
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Website saves stay in this browser and don’t transfer to the app.
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The game loads here. Choose a difficulty to start or resume a puzzle.
LEARN THE TWIST
How to play Renban Sudoku
Renban requires consecutive values across the whole line, not increasing order along the path. This makes it different from a thermometer.
The rules
Fill each row, column, and 3×3 box with 1–9, without repeats. Each purple line contains consecutive, nonrepeating digits in any order.
A useful first move
The largest and smallest digits on a line differ by its length minus one. If a three-cell line contains 2, its set must be 1–2–3 or 2–3–4.
A three-cell purple line can contain 5, 3, 4: it uses the consecutive set 3–4–5. It cannot contain 3, 4, 6 because the set skips 5, or 3, 4, 4 because a digit repeats.
Controls, difficulty, and saved games
Choose Beginner, Easy, Medium, Hard, or Expert above. Select an empty cell, then tap a number or use your keyboard. Notes let you pencil in candidates; three hints are available. Three mistakes end the puzzle.
Every mode and difficulty keeps a separate save in this browser. You can switch puzzles and return to your place. Clearing site data removes these saves; they do not sync with another device or the iPhone app. Settings include night mode and optional automatic cell advancement.
Correct entries earn points. High scores are stored by mode and difficulty and update only when beaten; completed-puzzle count and day streak are shared.
FIFTEEN WAYS TO PLAY
Explore all Sudoku modes
A familiar grid, a different kind of logic. Every mode is free to play in your browser.