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.