Sudoku Challenges

Daily puzzles. Race friends. Solve together.

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Why players stay

Play on your own, race on identical clues, or solve one board together.

Choose Solo for a puzzle at your own pace. Race gives each player a separate board with the same clues. Together synchronizes one board so you and a partner can work through deductions as a team. Start solo without an account; sign in when you want saved ranked Daily results and streaks.

01

Solo: your own pace

Choose Easy, Medium, Hard, or Expert. Use Notes to keep candidates and Undo to revisit an entry.

02

Race: separate boards

Both players receive identical clues. Solve independently and compare progress on the same puzzle.

03

Together: one shared board

Entries synchronize between partners. Explain a deduction in match chat, then place the digit on your shared grid.

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 guessingPlace a digit only when you can explain why it belongs there. A unique solution alone does not tell you the next move.

Try one deduction

Find the missing digit before you start a puzzle.

  1. Read this row

    5 · 3 · blank · 6 · 7 · 8 · 9 · 1 · 2. Which digit is missing? List 1 through 9 and cross off every placed value.

  2. Prove the placement

    Only 4 remains, so the blank must be 4. In a real board, also check its column and box; if either already has a 4, an earlier entry is wrong.

  3. Keep the notes consistent

    After placing 4, erase candidate 4 from other empty cells in its row, column, and box. Visit the worked candidate examples to learn what a pair lets you remove next.

Multiplayer

Choose competition or cooperation before inviting a friend.

Use Race when you want separate solves on identical clues. Use Together when you want one shared board and a conversation about the next move. Create a private invitation for someone you know; matching with a stranger depends on another player being available. Live rooms need a connection.

Race exampleYou fill a cell on your board; your opponent still has to find it independently on theirs.

Together exampleYour partner fills a cell and it appears on the shared board. Use chat to explain the row, column, or box that proves it.

Native optionDownload the iOS app for offline-friendly play.

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Quick answers

Free Sudoku Online FAQ

Can I play Sudoku online for free?

Yes. Sudoku Challenges 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 Sudoku Challenges 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

Daily Sudoku Email

A fresh Sudoku in your inbox, every day.

Start your daily challenge with one clean puzzle reminder, streak motivation, and a quick link back to your board.

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