--- title: "Expert Sudoku: Play Free Online, No Ads | Sudoku Flow" description: "Play Expert 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/expert/ language: en --- # Expert Sudoku Free Expert 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. ## Expert · #1 Daily Sudoku grid: ```text . . . | . 4 . | 3 . . . . 3 | . . 2 | . 9 . . . . | . . 9 | . 1 5 ------+-------+------ 9 . . | . . . | . 7 3 . . . | 9 . . | 5 . . 5 . 4 | 2 . 7 | . . . ------+-------+------ 8 9 . | . . . | 7 . . . 3 . | . . . | 1 2 . . . 6 | . 2 8 | . . . ```
What does this puzzle need?
## What Expert puzzles ask of you We re-solved all 11,034 Expert puzzles in the app with its hint engine, always taking the easiest step that works. This is the hardest step each one needed: 1. [Skyscraper](https://sudokuflow.com/lessons/skyscraper/) 55.1% 2. [Y-Wing](https://sudokuflow.com/lessons/yWing/) 30.3% 3. [Empty Rectangle](https://sudokuflow.com/lessons/emptyRectangle/) 5.9% 4. [Simple Coloring](https://sudokuflow.com/lessons/simpleColoring/) 4.4% 5. [X-Wing](https://sudokuflow.com/lessons/xWing/) 3.7% 6. [Swordfish](https://sudokuflow.com/lessons/swordfish/) 0.5% 7. [Naked Quad](https://sudokuflow.com/lessons/nakedQuad/) under 0.1% [What each Sudoku difficulty level asks of you →](https://sudokuflow.com/data/sudoku-difficulty-levels/) ## How to solve Expert Sudoku What makes a puzzle Expert is the hardest step it needs. Most often that step is Skyscraper (55%), Y-Wing (30%), or Empty Rectangle (6%). Expert puzzles stall until you spot a pattern. Most need a Skyscraper, where one number has exactly two places in each of two rows and one end of them lines up, or a Y-Wing, three squares with two candidates each that share numbers. Keep your notes complete, or these patterns stay hidden. [Learn Skyscraper step by step →](https://sudokuflow.com/lessons/skyscraper/) ## Expert Sudoku: questions and answers ### How many numbers do Expert puzzles start with? Expert puzzles here start with 26 to 28 of the 81 squares filled in, most of them with 26. ### Do Expert 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 Expert? One level up, Master puzzles are most often decided by XY-Chain. ## 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** Skyscraper (55%), Y-Wing (30%), or Empty Rectangle (6%) - [Master Sudoku](https://sudokuflow.com/play/master/) 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 Expert Sudoku](https://sudokuflow.com/printables/sudoku/expert/) - [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.