Sudoku
A new daily puzzle every day. Three difficulty levels. Notes mode included.
About
Daily Sudoku — Same Puzzle for Everyone
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.
Use Notes mode to pencil in candidates, arrow keys to navigate, and the number pad (or keyboard) to fill cells. Conflicts are highlighted in red automatically.
Daily Puzzle
New puzzle every day, seeded by date. Same for all players.
Notes Mode
Pencil candidate numbers into cells without committing.
Conflict Highlight
Duplicate numbers in the same row, column, or box turn red instantly.
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
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.