Free online sudoku with three difficulty levels — easy, medium, and hard. One fresh daily puzzle for every player. No signup, no ads, no tracking. Just clean logic puzzles in your browser.
A gentle warm-up with most digits already given. Solvable with simple scanning and elimination. Ideal for a quick break.
The standard daily challenge. Scanning, elimination, and pencil marks needed. The everyday tempo for regular players.
Few givens and deep logic required. Naked pairs, hidden singles, and X-wing patterns come into play. Bring patience.
Mark candidate numbers in any cell to plan your moves. Toggle notes mode with N. Pencil marks auto-clear when you commit a digit.
The active row, column, and 3×3 box light up. Cells holding the same digit glow across the board, helping you scan faster.
Step back through any move with full state restoration. Press Z to undo, Y to redo. Mistakes are never permanent.
One fresh sudoku each UTC day. The same grid for every player worldwide — solve at your own pace, compare your time.
Sudoku Master is a free online sudoku game with one fresh puzzle every day. Three difficulty levels — easy, medium, and hard — cover everything from a five-minute coffee break to a full evening of deep logic. The game runs entirely in your browser, with no signup, no ads, and no tracking.
Every daily sudoku is generated from a date-based seed, which means every player on Sudoku Master solves the exact same grid on the same day. Your time, your mistakes, and your streak are stored locally on your device — nothing is shipped to a server.
Whether you are new to sudoku or chasing a faster solve time, Sudoku Master gives you a clean, focused board, a full set of solving tools, and a fresh puzzle every twenty-four hours.
Sudoku is a number-placement logic puzzle played on a 9×9 grid. The grid is divided into nine 3×3 boxes, and the puzzle starts with some cells already filled in — these are the givens. Your task is to fill every empty cell so that each row, each column, and each 3×3 box contains the digits 1 through 9 exactly once.
There is no math involved. Sudoku is purely a logic puzzle: any digit could be replaced with any other symbol, and the puzzle would work the same way. What you are really doing is eliminating possibilities until only one digit fits each cell. Every well-formed sudoku has exactly one solution, reachable through pure logic without guessing.
The modern puzzle was popularised in Japan in the 1980s under the name sudoku, short for sūji wa dokushin ni kagiru — "the digits must be single." It became a global phenomenon in the mid-2000s and has stayed one of the most-played logic games in the world ever since.
The rules of sudoku are simple. Every row of nine cells must contain the digits 1 to 9 with no repeats. Every column of nine cells must contain the digits 1 to 9 with no repeats. Every 3×3 box must contain the digits 1 to 9 with no repeats. The puzzle is solved when every cell holds a digit and all three rules are satisfied at the same time.
To play sudoku at Sudoku Master, click any empty cell to select it and press a number key from 1 to 9 to place that digit. Use the arrow keys to move the cursor between cells, press N to switch into pencil-mark mode for candidate notes, and press Z to undo a move. The active row, column, and box are highlighted automatically, and matching digits glow across the board so you can spot conflicts at a glance.
If you are stuck, the hint button reveals one cell — you get up to three hints per puzzle. Mistakes are tracked but not punished. The clock keeps running until the grid is complete.
Look at one digit at a time across the whole board. For each row, column, and 3×3 box where that digit is missing, find the only cell where it can legally go. Scanning solves most easy sudoku puzzles on its own.
When scanning runs out, mark every candidate digit in each empty cell. As you place numbers, candidates eliminate themselves. Pencil marks are the foundation of every medium and hard sudoku technique.
If two cells in the same row, column, or box share exactly the same two candidates, those digits are locked there. You can eliminate them from every other cell in that unit — a powerful step on hard puzzles.
When a candidate appears in exactly two cells across two rows, and those cells line up in the same two columns, the digit must go in those four cells. Every other appearance in those columns can be eliminated.
A daily sudoku is a single puzzle that everyone plays on the same day. Instead of generating a random grid for each player, Sudoku Master ships one fresh puzzle every UTC day at midnight. The puzzle is the same grid for every player around the world, so your time and accuracy can be compared on the network leaderboard.
Daily sudoku changes the rhythm of the game. You are not playing against an endless feed of puzzles — you are playing today's puzzle, and tomorrow's puzzle is tomorrow. It builds streaks, makes solve times meaningful, and turns sudoku into a small daily ritual rather than a time sink.
If you miss a day, the streak resets. If you finish today's puzzle, you get to try tomorrow's at midnight UTC. Three difficulty levels each get their own daily puzzle, so you can pick the tempo that fits your day.
Most online sudoku sites bury the puzzle under signup walls, banner ads, and notification popups. Sudoku Master does not. There is no account to create, no email to enter, no cookie banner to dismiss, and no advertising network watching what you do. Your stats stay on your device. The grid is the whole product.
The game runs in any modern browser, on desktop or phone, with full keyboard support. Pencil marks, smart highlights, undo and redo, and a three-hint allowance give you everything you need to solve hard sudoku without leaving the page. The only thing competing for your attention is the puzzle in front of you.
If you want a free online sudoku game that respects your time and your privacy, Sudoku Master is built for you. Play today's daily sudoku puzzle or view your sudoku stats and the network leaderboard.