Pure Sudoku
CLEAN. SMART. ADDICTIVE.
Today's puzzle Today
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Prefer solo practice? Pick a difficulty to generate a fresh board instantly.
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Play Sudoku Online — Free, Fast, Beautiful
Pure Sudoku delivers handcrafted puzzles in your browser with no downloads, clutter, or distracting ads. Choose your level, sharpen your skills with our smart tools, and keep an eye on personal bests as you improve.
Why players choose Pure Sudoku
- Clean interface built for focus and easy readability on desktop or mobile.
- Instant puzzle generation powered by our advanced solver and uniqueness checks.
- Smart notes, conflict detection, and undo history designed for serious solvers.
- Performance tracking with average times per difficulty to motivate steady improvement.
Challenge friends in real-time Sudoku races
Invite a friend with a private link or join the quick-match queue to battle players worldwide on the same board. Every move is synced through our Pure Sudoku multiplayer service so you can celebrate wins instantly.
Prefer touch controls? Grab the Pure Sudoku iOS app for a native, offline-friendly experience.
How to Play Sudoku: Rules & Basics
Sudoku is a logic-based number puzzle played on a 9x9 grid. Fill the grid so each row, column, and 3x3 box holds the digits 1 through 9 exactly once.
- The Grid: 81 cells divided into nine 3x3 regions (often called boxes or subgrids).
- The Rule of One: Each digit 1-9 appears only once in every row, column, and box.
- No Math Required: No arithmetic; just logic, scanning, and clean deductions.
Mastering Sudoku Strategy
When puzzles get tougher, lean on these core tactics to lower your times in multiplayer races.
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Scanning (Cross-Hatching)
Pick a digit and scan rows and columns to see where it cannot go. Often one cell remains inside a 3x3 box, letting you place it instantly.
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Pencil Marking (Candidates)
Use Pencil Mode to jot possible digits in a cell. Noting options like 4 or 7 keeps patterns visible for advanced techniques.
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Single Candidate Elimination
Check a cell’s row, column, and box. If every digit except one is present (say only 4 is missing), you’ve found a naked single.
Why Play Multiplayer Sudoku?
Pure Sudoku takes the classic solitary experience and adds a competitive edge.
- Speed Training: Races force faster pattern recognition than solo play.
- No Guessing: Every board has a unique, logic-only solution—never guess.
- Distraction-Free: Clean interface, no banner ads or pop-ups; just you and the grid.