Puzzle Complete!
Game Over!
You reached the mistake limit.
Sudoku
Classic • Easy
New Game
Classic Sudoku
Diagonal Sudoku
Easy
Medium
Hard
Extreme
Preferences
General
Casual Mode
Highlight when input does not match the correct solution
Mistake Limit
End the game or warn after a set number of mistakes
3
Auto Remove Notes
Automatically remove pencil notes after a correct entry
Remaining Numbers
View the possible places left for each number
Prevent Conflicting Notes
Disallow notes that conflict with existing numbers
Show Popover
Show popover when clicking on a cell
Highlight Row
Highlight Column
Dark Theme
Variant Preferences
Highlight Block
Highlight Diagonals
How to Play
The Basics
The board is a 9×9 grid, divided into nine 3×3 blocks. Fill every cell with numbers from 1 to 9.
Rows & Columns
Each row and column must contain unique numbers without duplicates.
Blocks Matter
Each 3×3 block must also contain the numbers 1 through 9, without repeats.
Casual Mode
Turn on Casual Mode in Preferences to check your entries against the solution. When off, only rule violations are flagged, not incorrect numbers.
Mistakes Happen
Mistakes are highlighted in red so you can spot them easily.
Make Notes
Use pencil mode to note possible numbers for a cell.
Keyboard Shortcuts
Game
Move Between Cells
Up Down Left Right
Jump Between Blocks
Ctrl + Arrow
Pencil
Pencil Mode
P
Auto Pencil Marks
Shift + P
Place Pencil Mark
Ctrl + 1...9
Input
Open Number Pop-Up
Enter
Clear Cell
Del / Backspace
Mouse Controls
Select Cell / Open Popover
Left Click
Direct Pencil Note Mode
Right Click
Scroll Value Up / Down
Mouse Wheel
Deselect Cell / Unfocus Grid
Click Outside
General
Show Shortcuts
Ctrl + ?
Undo Move
Ctrl + Z
Back to Main Menu
Ctrl + M
How to Play
F1
About Sudoku
Sudoku
A clean, beautiful Sudoku puzzle game.
Ported from the GNOME / GTK4 desktop application.
Licensed under GPL-3.0-or-later