--- title: "Master Sudoku: Play Free Online, No Ads | Sudoku Flow" description: "Play Master Sudoku free in your browser, with notes, undo and hints and no ads. Every puzzle has one answer and is graded by the technique it needs." url: https://sudokuflow.com/play/master/ language: en --- # Master Sudoku Free Master Sudoku puzzles to play right here, with no ads and no sign-up. When you finish one, New puzzle gives you the next; your progress stays on this device. ## Master · #1 Daily Sudoku grid: ```text . . 2 | . . . | . 1 . . . . | . . 6 | 5 2 . 8 . . | 2 . . | . . 4 ------+-------+------ 5 . . | . 4 1 | 2 . . . . 4 | 3 7 . | . . 1 9 . . | . 6 . | . . . ------+-------+------ 4 . 7 | . 8 . | 6 . . . . . | 6 . . | 4 . . . . 8 | 9 . . | . . . ```
What does this puzzle need?
## What Master puzzles ask of you We re-solved all 9,590 Master puzzles in the app with its hint engine, always taking the easiest step that works. This is the hardest step each one needed: 1. [XY-Chain](https://sudokuflow.com/lessons/xyChain/) 59.3% 2. [W-Wing](https://sudokuflow.com/lessons/wWing/) 28.1% 3. [X-Chain](https://sudokuflow.com/lessons/xChain/) 6.1% 4. [XYZ-Wing](https://sudokuflow.com/lessons/xyzWing/) 5.0% 5. [Grouped Two-String Kite](https://sudokuflow.com/lessons/groupedTwoStringKite/) 0.9% 6. [Two-String Kite](https://sudokuflow.com/lessons/twoStringKite/) 0.4% 7. [WXYZ-Wing](https://sudokuflow.com/lessons/wxyzWing/) under 0.1% [What each Sudoku difficulty level asks of you →](https://sudokuflow.com/data/sudoku-difficulty-levels/) ## How to solve Master Sudoku What makes a puzzle Master is the hardest step it needs. Most often that step is XY-Chain (59%), W-Wing (28%), X-Chain (6%), or XYZ-Wing (5%). Master puzzles are mostly decided by chains. An XY-Chain links squares with two candidates each, end to end; a W-Wing joins two identical pairs through a number that has only two places in a row, column or box. Follow the chain and see what both of its ends rule out. [Learn XY-Chain step by step →](https://sudokuflow.com/lessons/xyChain/) ## Master Sudoku: questions and answers ### How many numbers do Master puzzles start with? Master puzzles here start with 26 to 30 of the 81 squares filled in, most of them with 26. ### Do Master puzzles need guessing? No. Every puzzle has exactly one solution, and the hint engine of our app solves each one with logic alone, one technique at a time. ### Can I get a hint while I play? Yes. Hint names the technique the next step needs and shows it on your board one step at a time, with the same hint engine our app uses. ### What comes after Master? One level up, Extreme puzzles are most often decided by ALS-XZ. ## All six levels - [Easy Sudoku](https://sudokuflow.com/play/easy/) Nearly Complete (95%) - [Medium Sudoku](https://sudokuflow.com/play/medium/) Hidden Single (100%) - [Hard Sudoku](https://sudokuflow.com/play/hard/) Pointing Pair (60%), Naked Pair (18%), Box/Line Reduction (13%), or Hidden Pair (6%) - [Expert Sudoku](https://sudokuflow.com/play/expert/) Skyscraper (55%), Y-Wing (30%), or Empty Rectangle (6%) - **Master Sudoku** XY-Chain (59%), W-Wing (28%), X-Chain (6%), or XYZ-Wing (5%) - [Extreme Sudoku](https://sudokuflow.com/play/extreme/) ALS-XZ (86%) or Unique Rectangle (12%) ## More Sudoku to play - [Print Master Sudoku](https://sudokuflow.com/printables/sudoku/master/) - [Daily Sudoku: four new puzzles every day](https://sudokuflow.com/daily/) - [Sudoku checker](https://sudokuflow.com/tools/sudoku-checker/) - [Sudoku for kids](https://sudokuflow.com/printables/kids/) ![Sudoku app icon](https://sudokuflow.com/assets/app-icon.png) ## Want more boards like this? We also make a Sudoku app for iPhone, iPad, Mac and Android. There are no ads in it at all, it works offline, and when you ask for a hint it shows you the technique instead of just filling in a number. [App Store iPhone, iPad, Mac](https://apps.apple.com/app/apple-store/id6502922368?pt=125379530&ct=sudokuflow_web&mt=8) [Google Play Android](https://play.google.com/store/apps/details?id=com.rubigogames.sudoku&referrer=utm_source%3Dsudokuflow%26utm_medium%3Dweb%26utm_campaign%3Dsite) Sudoku Flow is made by Rubigo Games, the developer of the Sudoku app recommended on this site.