Pure Sudoku

PLAY FREE SUDOKU INSTANTLY

Clean logic-only puzzles with smart notes, daily streaks, and real-time friend races. Solo play starts without an account.

No signup for solo Logic-only boards Daily leaderboard
Daily Challenge

Today's puzzle Today

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    Be the first to set a time today.

    Pick a fair logic-only board and race the same puzzle.

    Why players stay

    A cleaner board, a daily reason to return, and races when you want pressure.

    Pure Sudoku keeps the grid quiet and the challenge clear: start a free solo puzzle immediately, use smart notes when the board gets dense, then sign in only when you want saved progress or ranked competition.

    01

    No-clutter solving

    Readable boards, clean controls, and no visual clutter on desktop or mobile.

    02

    Logic-only boards

    Fresh puzzles are checked for unique solutions, so every solve rewards deduction.

    03

    Daily momentum

    Beat yesterday's time, build a streak, and compare your run on the daily leaderboard.

    Rules & basics

    How Sudoku works

    Fill a 9x9 grid so every row, column, and 3x3 box contains the digits 1 through 9 exactly once. There is no arithmetic involved; the puzzle is solved by scanning, eliminating, and placing only what the grid proves.

    The grid81 cells divided into nine clean 3x3 regions.

    The rule of oneEach digit appears once per row, column, and box.

    No guessingGood Sudoku boards always have a logic-only path forward.

    Strategy rhythm

    Three habits that make the grid open up.

    1. Scanning

      Pick one digit and scan across rows and columns to find where it cannot go. Often the last open cell in a 3x3 box becomes obvious.

    2. Pencil marking

      Use notes for possible digits when the board gets dense. Seeing candidates like 4 or 7 keeps advanced patterns visible.

    3. Single candidate elimination

      Check a cell's row, column, and box. If every digit but one is already ruled out, you have found a naked single.

    Multiplayer

    Race friends without giving up fair Sudoku.

    Invite a friend with a private link or join quick match to solve the same unique board in real time. Races reward clean scanning, accurate notes, and steady decisions because nobody gets a different puzzle.

    Speed trainingRacing encourages faster pattern recognition than solo play.

    Fair boardsEvery player solves the same unique, logic-only puzzle.

    Native optionDownload the iOS app for offline-friendly play.

    How to Play Sudoku Daily Sudoku Medium Sudoku Expert Sudoku Multiplayer Sudoku Sudoku Generator Sudoku App 6x6 Sudoku Tetris Sudoku 25x25 Sudoku Blog Learn to Play Game Types & Variations Printable Resources Solvers & Generators

    Quick answers

    Free Sudoku Online FAQ

    Can I play Sudoku online for free?

    Yes. Pure Sudoku runs in your browser, so you can start a free solo Sudoku puzzle without downloading an app or creating an account.

    When do I need an account?

    Solo play does not require one. Sign in when you want to save daily times, keep streaks, and appear on leaderboards.

    Which Sudoku level should I start with?

    Start with Easy if you are learning, Medium for steady practice, and Hard or Expert when you are comfortable using notes and elimination.

    Does Pure Sudoku work on phones?

    Yes. The board, keypad, notes, hints, and daily challenge are designed for mobile, tablet, and desktop browsers.

    Can I play Sudoku with friends?

    Yes. Use Multiplayer to invite a friend with a private link, join with a code, or find a quick match on the same fair board.

    Download on the App Store
    Medium
    Mistakes: 0
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    Tap a cell to begin.