QuietdokuKiller Sudoku
Sudoku with cages: every dashed cage shows a sum, and the digits inside must add up to it without repeating. No digits are given — the sums are your clues. Pick a level and play right here.
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The rules in three lines
- Fill the 9×9 grid so every row, column and 3×3 box contains 1–9 exactly once.
- The digits in each dashed cage add up to the small number in its corner.
- A digit cannot repeat within a cage.
Five levels
Easy Killer Sudoku
Cage combinations only. The best way to learn.
Play →Medium Killer Sudoku
Adds the rule of 45 and cages locked inside a box.
Play →Hard Killer Sudoku
Multi-row rule of 45 and innie–outie differences.
Play →Expert Killer Sudoku
The hard techniques with bigger cages.
Play →Extreme Killer Sudoku
Combination exclusion and X-Wing style patterns. Still no guessing.
Play →Daily killer sudoku
One new puzzle per level every day, the same for everyone.
Play →Rules and combination chart
Every cage combination on one page, plus the three tricks that solve most puzzles.
→Killer sudoku questions
What is killer sudoku?
Killer sudoku is a sudoku variant where the grid is divided into dashed cages, each with a sum. Besides the usual sudoku rules, the digits in each cage must add up to its sum and cannot repeat inside the cage. It is also called sum sudoku or キラーナンプレ in Japan.
Is it free, and are there ads?
Killer sudoku on quietdoku.com is free to play with no ads, no pop-ups and no sign-up. The Quietdoku app adds a daily killer puzzle in five levels, streaks and rankings, also without ads.
Do I need to be good at math?
Only simple addition. The combination bar under the board lists every way to make the selected cage’s sum and greys out what no longer fits your own digits, so you can focus on the logic.
Quietdoku for iPhone and Android
Take the quiet with you.
The app works offline and adds the parts that make a habit stick.
- Four daily puzzles, one per level
- Streaks and collectible achievement cards
- Worldwide and country rankings, seasons
- Challenge a friend with a link
- Sign in with Apple or Google to keep progress across phones
Scan to download
Free · No ads · Optional Pro for unlimited practice