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Play
Play Sudokus in any difficulty using our state of the art Sudoku web app.
Learn
Learn the rules of Sudoku and explore all the necessary techniques.
Solver
Stuck on a Sudoku? Use the Solver for a quick and easy way to see how a Sudoku can be solved step-by-step.
Practice
Having difficulties applying a certain technique? Use the practice mode to get grid positions where that specific technique can be applied.
Construct
Want to create your own Sudokus for friends and family? This mode is for you!
Print
Print out randomly generated Sudokus of specified difficulties to take them to the park or your sofa.
This website as a mobile app? – Simply add it to your phone's home screen using the browser's menu.sudoku.coach is the all-in-one website for most of your Sudoku needs.
Here you can solve Sudokus, learn new techniques, practice those, print out Sudokus on paper and much more.
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Website UpdateFeb 12th 2023
- General
- Many small improvements
- Play
- Hint system revised. There are now also hints if the cell candidates are wrong.
- NEW: All past "Sudokus of the day" can now also be selected in game mode.
- Colors now shine slightly through the selection
- Solver
- Slider usability improved
Website UpdateJan 20th 2023
- Play
- Colors on a Sudoku can now be hidden if they are purely aesthetic
- Construction
- NEW: When generating, you can now adjust how often a specific technique must occur minimally and maximally
- More options when copying a Sudoku
- Print
- NEW: User defined Sudokus can now be printed
Website UpdateJan 10th 2023
- General
- Sudoku of the Day is now on international daily themes
- some small improvements
- Construct
- NEW: batch Sudoku generation
- NEW: Sudoku templates
- export as text (e.g. CSV)
Website UpdateNov 5th 2022
- General
- added support for many old browsers
- some small improvements
- Play
- timer is now saved between sessions and pauses if website is in background
- Practice
- links for triples and quadruples work again
Website UpdateOct 25th 2022
- General
- NEW: page "home"
- NEW: Sudoku of the Day
- added YouTube and Instagram links
- many usability improvements
- several bugfixes
- no connections to google and such whatsoever, if opted out
- Play
- NEW: region and digit highlighting - it can be adjusted in the settings menu
- NEW: added option to fill all missing cell candidates
- NEW: added customization control
- difficulties of all Sudokus are now displayed underneath the grid
- adjusted difficulties
- Solver
- enlarged timeline slider
- Construct
- generation now tries to find a Sudoku until it succeeds
- Print
- NEW: mode for printing pages with mixed difficulties
Website UpdateAug 5th 2022
- adjusted font sizes
- added tooltips
- added confirmation for switching to solver and pasting
- added visual feedback when player should start a new game
- fixed browser history navigation errors
Website UpdateAug 2nd 2022
- text/translation improvements
- faster icon loading
- wait indicator while page loads
- added confirmation when deleting all cells
- started Sudokus are correctly restored
Website UpdateJul 27nd 2022
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Play
- play computer generated Sudokus in different levels of difficulty
- play self-entered Sudokus (e.g. from a newspaper)
- play imported Sudokus (via unofficial standard or via sudoku.coach format)
- open the currently played Sudoku in the computer solver
- control the Sudoku grid by mouse or keyboard shortcuts (you can see which shortcuts are available by the keyboard icon in the menu bar)
- get tips on the current position, how to advance in the game
- choose in the options in the menu bar between standard candidate notation and Cell&Box candidate notation
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Solver
- load the recently played Sudoku in the solver
- import a Sudoku by text (by unofficial standard or by sudoku.coach format)
- go step by step through all the necessary steps to solve the sudoku
- quickly scroll through all necessary steps
- get a direct overview of the difficulty of a Sudoku puzzle
- get a description of each step, what the solver is doing, and why it works (with a link to a detailed description of the technique)
- considers the entered cell candidates
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Construct
- let create your own Sudoku
- specify numbers at certain positions
- say which cells should remain empty or should be filled in any case
- have a correct Sudoku created from your input
- these restrictions still exist:
- it may be necessary to press the "Create" button several times to get a valid Sudoku
- some inputs make a Sudoku impossible
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Learn
- get a detailed description of all techniques mastered by sudoku.coach computer solver
- playable Sudokus can be opened directly in game mode or solver mode
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Practice
- choose a technique to practice
- all techniques that the computer solver uses are supported
- adjust the difficulty of the exercises
- get tips where you can apply the current technique
- get the solution and go to the next problem
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Print
- print out computer generated Sudokus of different difficulty levels
- select the difficulty level, the number of Sudokus per page and the number of pages to print
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General
- in game or solver mode: simply copy Sudokus to the clipboard via CTRL-C, and paste them again via CTRL-V
- increase the visibility of the numbers by clicking the corresponding button in the menu bar
- two languages implemented: English, German