King Sudoku
Sudoku where cells that touch diagonally may not repeat a digit, like a chess king that cannot attack itself.
- Logic
- New puzzle every day
- Free, plays in your browser
- Mouse, touch or keyboard
- Added 29 October 2026
- #sudoku
- #king
- #numberpuzzle
- #dailypuzzle
- #logic
- #relaxing
King Sudoku
0% · Getting ready
Loading King Sudoku 0%Watch a 20-second trailer
A real run of the game, recorded with captions and no sound.
How to play
- Fill the grid so every row, column and 3 by 3 box holds 1 to 9 once.
- In this variant, two cells that touch at a corner may not hold the same digit either.
- Tap a cell, then a number. Notes mode lets you pencil in candidates. Conflicts show in red as you play.
- Pick Daily for today's puzzle, the same for everyone, or Easy and Hard for fresh ones. Your time is saved when you finish.
Controls: mouse, touch or keyboard. Made by CalcoTools.
Tips and strategy
- A digit placed in a cell removes itself from all eight surrounding cells, so scan around every new digit.
- Look at the middle of each box first. Its cell touches all the others in the box.
- Use notes in cells with two or three candidates and clear them as neighbours fill.
- When stuck, check which box cell a missing digit could sit in without touching a copy.
FAQ
- What does the king rule add?
- Two cells that touch diagonally cannot share a digit. Cells that touch sideways already share a row or column.
- Is every puzzle solvable by logic?
- Each puzzle has exactly one solution, checked when it is made.
- Is the daily the same for everyone?
- Yes, on the same UTC day.
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