Sudoku Online: Multiplayer 1v1

Play Sudoku online against friends in real-time 1v1 duels, take on the Daily Challenge and climb its worldwide ranking, or unwind with hundreds of classic puzzles offline. No ads.

DAILY CHALLENGE — ONE PUZZLE, ONE RANKING
• A new Sudoku every day, the same one for every player.
• The week ramps up: easy on Monday, expert on Saturday and Sunday.
• Your score is your time plus a penalty for every mistake. Submit it and see where you rank.
• Keep your streak alive, look back at previous days' rankings and set an optional daily reminder.

MULTIPLAYER SUDOKU — REAL-TIME 1V1
• Create a private game, share the code with a friend and start playing in seconds.
• Both players solve the same Sudoku at the same time; every correct number scores a point.
• Wrong numbers cost you a time penalty, so think before you tap.
• Watch your rival's progress live and race to fill the grid first.

CLASSIC SUDOKU — SINGLE PLAYER
• Hundreds of hand-picked puzzles in four difficulties: easy, medium, hard and expert.
• Progress and best times are saved on every puzzle, so you can pick up where you left off.
• Play offline, anywhere: on the train, in bed, on a break.

DESIGNED FOR FOCUS
• Dark mode and more than 20 themes, light and dark. Lavender and Night are free; Sudoku Pro, a one-time purchase, unlocks the rest.
• No ads interrupting your game.
• Pencil notes: long-press a cell to jot down up to three candidate numbers.
• Clean, distraction-free board with big, readable numbers.
• Relaxing music and sound effects you can mute with one tap.
• Available in English, Spanish, Catalan, German and French.

HOW TO PLAY
1. Pick Single player and a difficulty, the Daily challenge, or Online multiplayer to start a duel.
2. Tap a cell, then tap a number. Long-press to add notes.
3. Fill the grid — or fill more cells than your opponent — to win.

Whether you want a quick logic puzzle, a daily Sudoku habit or a competitive number game with friends, Sudoku Online is the Sudoku app that makes solving social. Download it and challenge someone today.

Recent changes:
• New: share your Daily Challenge result with friends — your time, mistakes and position in the ranking.
• Game invitations now include the download link, so your friends can join faster.
• Bug fixes and stability improvements.