QuietdokuExtreme Killer Sudoku
Extreme puzzles need combination exclusion and X-Wing style patterns, with large cages and no single-cell gifts. Every one is still solvable by logic alone.
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More killer sudoku
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 →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.
→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
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Free · No ads · Optional Pro for unlimited practice