Daily Sudoku Puzzle
A brand-new Sudoku challenge every day. Pick your difficulty, fill the grid so every row, column, and 3×3 box contains the digits 1–9, and beat the clock.
How to Play Sudoku
Sudoku is one of the world's most popular logic puzzles. The goal is simple: fill a 9×9 grid with the digits 1 through 9 so that each row, each column, and each of the nine 3×3 boxes contains every digit exactly once. No math is required — just pure logical deduction.
Start by scanning the grid for rows, columns, or boxes that already have many digits filled in. The fewer blanks, the easier it is to figure out which number goes where. Use pencil notes to track candidates in each cell, then eliminate possibilities as you progress.
Sudoku Tips & Strategies
Naked singles: If a cell has only one possible candidate (all other digits appear in its row, column, or box), that candidate is the answer.
Hidden singles: If a digit can only go in one cell within a row, column, or box, place it there — even if the cell has other candidates.
Pencil notes are your friend: Toggle notes mode and jot down every candidate for each empty cell. This visual map makes it much easier to spot patterns. As you place digits, come back and prune your notes.
Work the boxes: The 3×3 boxes are the most constrained regions. Cross-reference box candidates with row and column information to eliminate options quickly.
What Makes Our Daily Sudoku Special
Our daily Sudoku is generated fresh each day with a deterministic algorithm — everyone who visits today gets the exact same puzzle, making it perfect for friendly competition. Compare your time with friends and family to see who can solve it fastest.
Choose from three difficulty levels: Easy (great for beginners and warm-ups), Medium (a balanced challenge for experienced players), and Hard (a serious test of logic with fewer starting clues). Every puzzle is guaranteed to have exactly one solution.
Use the navigation arrows to revisit previous days' puzzles, or reset today's puzzle to start fresh. The built-in timer tracks your solving time, and the Check button removes incorrect cells so you can correct course without starting over.
The History of Sudoku
Modern Sudoku was invented in 1979 by Howard Garns, an American architect, and published under the name "Number Place." The puzzle was later popularized in Japan in the mid-1980s by the publisher Nikoli, who gave it the name "Sudoku" — short for "sūji wa dokushin ni kagiru" (the digits must remain single).
Sudoku became a worldwide phenomenon in 2004 when it was introduced to British newspapers, sparking a global puzzle craze. Today, millions of people play Sudoku daily, and the puzzle appears in newspapers, apps, and websites around the world. It's a proven way to keep your mind sharp and enjoy a few minutes of focused, satisfying problem-solving.
Frequently Asked Questions
Is the daily Sudoku the same puzzle for everyone?+
Yes. Our algorithm generates one puzzle per difficulty level per day using a date-based seed. Everyone who visits on the same day gets the exact same puzzle, so you can compete with friends.
How do the difficulty levels work?+
Easy puzzles start with about 38 given digits, Medium with about 30, and Hard with about 24. Fewer starting clues means more deduction is required. Every puzzle regardless of difficulty has exactly one valid solution.
What does the Check button do?+
The Check button compares your filled-in digits against the solution and removes any that are incorrect. Correct digits and given digits are untouched. This lets you fix mistakes without resetting the entire puzzle.
What is notes (pencil) mode?+
Toggle Notes mode to jot down candidate numbers in a cell instead of placing a final answer. Small digits appear in the cell corners. This is the equivalent of pencil marks in a paper puzzle and helps you track possibilities as you solve.
Can I play previous days' puzzles?+
Yes! Use the left arrow to navigate to any previous day's puzzle. Each past puzzle is fully playable with its own timer. The right arrow returns toward today's date.
Does Sudoku require math?+
No. Despite using numbers, Sudoku is purely a logic puzzle. The digits 1–9 are just symbols — you could replace them with letters or colors and the puzzle would work the same way. No arithmetic is involved.