Free Sudoku Online — Daily Puzzle & Solver Mode
Play the daily puzzle in Easy, Medium, or Hard — or switch to Solver mode to solve any Sudoku from a newspaper or app instantly. No ads, no signup.
About
Daily Puzzle + Sudoku Solver — Free, No Ads
Each day a new puzzle is generated for Easy, Medium, and Hard difficulty. The seed is based on today's date, so every player gets the same puzzle — making it easy to compare times with friends.
Stuck on a puzzle from a newspaper or app? Switch to Solver mode — enter the given clues, click Solve, and the answer fills in instantly. Notes mode, conflict highlighting, and a timer are included in Play mode.
Solver Mode
Enter any Sudoku grid and click Solve — the answer fills in instantly using backtracking. No ads, no paywall.
Daily Puzzle
New puzzle every day, seeded by date. Same for all players.
Notes Mode
Pencil candidate numbers into cells without committing.
Timer
Track how long each puzzle takes and improve your personal best.
How to Play
Sudoku Rules
Select a cell
Click or tap any empty cell to select it. The row, column, and 3×3 box highlight automatically.
Enter a number
Click a number on the pad (or press 1–9 on your keyboard). Use Notes mode to pencil in candidates.
Solve the grid
Fill every cell so each row, column, and box contains 1–9 exactly once. Conflicts highlight in red.
Use Cases
Who Plays Sudoku & Why
Daily Puzzle Habit
One new puzzle every day across three difficulty levels — the same puzzle for every player worldwide. It's a low-commitment daily ritual that takes 5–20 minutes depending on difficulty.
Logical Thinking Workout
Sudoku is pure deductive reasoning — no maths required, just elimination. Working through a Hard puzzle is a structured cognitive workout that strengthens systematic thinking.
Travel & Offline Play
The game loads once and runs entirely in your browser with no server calls. It works offline on a plane, commute, or anywhere without a reliable connection.
Difficulty Progression
Start on Easy to learn the basic elimination techniques, move to Medium once those feel automatic, then take on Hard to learn advanced strategies like naked pairs and hidden triples.
FAQ
Frequently Asked Questions
Click the Solver tab above the game grid. Enter the given numbers from your puzzle into the blank 9×9 grid, then click Solve. The solver fills in all remaining cells in under a second. Click Clear to reset and enter a different puzzle. Free, no ads, no signup required.
Yes — any valid Sudoku with at least one solution. Enter the clues from a newspaper, app, or puzzle book and click Solve. If the puzzle is invalid or has no solution, the solver will tell you it is unsolvable.
Completely free with no ads. Every other sudoku solver site is covered in ads — this one runs entirely in your browser with no interruptions, no account, and no download required.
Fill the 9×9 grid so every row, column, and 3×3 box contains digits 1–9 exactly once. Select a cell, then enter a number.
Yes. A new puzzle is generated daily for each difficulty. The seed is based on today's date, so everyone gets the same puzzle.
Easy (38 clues), Medium (30 clues), Hard (24 clues). Fewer clues = harder puzzle.
Notes lets you write small candidate numbers inside a cell. Useful for advanced solving techniques like naked pairs and hidden singles.