Sudoku

The classic number puzzle, now with a daily challenge — fill the grid so every row, column and box holds one to nine.

Loads instantly in your browser — no download.

Paste this wherever you want the game to appear. It is free, needs no account, and the game carries no ads and no third-party trackers. Please keep the credit link underneath — that is the only thing we ask in return.

Size

Responsive 640 × 480 800 × 600

Responsive keeps the frame inside your column on a phone. Fixed sizes are easier to drop into an older layout.

HTML to paste

<div style="position:relative;width:100%;aspect-ratio:16/10">
  <iframe src="https://www.gamedavinci.com/embed/sudoku/" title="Sudoku"
    style="position:absolute;inset:0;width:100%;height:100%;border:0"
    allow="fullscreen; autoplay; gamepad" loading="lazy"></iframe>
</div>
<p><a href="https://www.gamedavinci.com/game/sudoku/">Sudoku</a> by <a href="https://www.gamedavinci.com/">GameDavinci</a></p>

Or just the iframe URL

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Daily challenge

Sudoku serves one puzzle a day, generated from the calendar date — so the board you play is the same board every other player gets. Solve it before the day is out to extend your streak. Your stats stay in this browser; there is nothing to sign up for.

Next puzzle in under 24 hours . See all daily challenges →

About this game

Sudoku is the logic puzzle that turned a page of newspaper filler into a worldwide habit, and this is a clean, fast version you can start in a second. The rule is famously simple: fill the nine-by-nine grid so that every row, every column and every three-by-three box contains the digits one to nine exactly once. No arithmetic, no guessing, no outside knowledge — every puzzle is solvable by reasoning alone, and every one is generated fresh with a guaranteed unique solution, so there is always exactly one right answer waiting to be deduced. There are two ways to play. The Daily Challenge is one shared grid for everyone, the same puzzle worldwide for your local date, with a difficulty that ramps across the week — gentle mid-week, a proper workout at the weekend. Solve it to build a streak, and each solve is saved so you can pick a grid back up if you close the tab; when you finish, a results card shows your streak, your fastest time and a countdown to tomorrow's puzzle, with a spoiler-free result you can share. Free play drops the calendar entirely: unlimited fresh puzzles across four difficulties whenever you want them, no waiting. Easy puzzles fall to straightforward scanning, Medium asks you to spot the digit that fits only one square in its box, and Hard and Expert demand genuine technique from anyone who has outgrown the gentler grids. Difficulty here means what it should, too — each puzzle is graded by the reasoning actually needed to crack it, not merely by how many squares were left blank. Pencil marks let you jot candidates into a cell exactly as you would on paper, and placing a digit clears that note from every square it rules out, sparing you the bookkeeping. Matching numbers and the row, column and box you are working in light up as you move, duplicates flag themselves immediately, and unlimited undo means an experiment never costs you a grid. Stuck? A hint fills one correct square, though it adds to your time. Play with the mouse, your finger, or entirely from the keyboard.

Controls

Click or tap a cell, then type 1-9 or use the number pad.

Keyboard

Notes mode pencils in candidates. Arrow keys move, Backspace clears.
N notes, U undo, H hint.

How to play

Fill every empty square so that each row, each column and each three-by-three box contains the digits 1 to 9 exactly once.

Every puzzle has exactly one solution and can be reached by logic alone — no guessing required.
Use pencil marks to track candidates when a square has more than one possibility.
Play the Daily Challenge — one shared grid a day — to build a streak, or switch to Free play for unlimited puzzles across four difficulties.

Read the full Sudoku rules and strategy →