Zenoku: Sudoku

Classic Sudoku with zero ads, a worldwide Daily Challenge, Game Center leaderboards, and buttery-smooth play. Free forever.

Zenoku is Sudoku the way it should be: beautiful, fast, and completely free of ads. No banners, no videos, no interruptions — ever. CLASSIC SUDOKU, BEAUTIFULLY INKED A crisp, newspaper-inspired design that stays out of your way. Every puzzle is generated with exactly one solution — you never have to guess. FIVE LEVELS, EASY TO EXTREME From relaxed morning solves to puzzles that demand real technique. Each level has its own rules for mistakes and hints. A NEW CHALLENGE EVERY DAY One daily puzzle, the same for every player in the world. Difficulty climbs through the week — build your streak and keep it alive. SMART TOOLS THAT KEEP UP WITH YOU • Pencil notes that clean themselves — place a number and it disappears from the notes of every related square • Tap any number to light up every copy on the board • Row, column, and box highlighting as you play • Undo, erase, and hints (they cost points — spend them wisely) COMPETE AND PROGRESS • Game Center leaderboards for every level — best score and best time • A milestones gallery full of goals to chase, with live progress • Lifetime statistics: win rates, best times, perfect games, streaks • Satisfying celebrations when you complete a row, column, or box MADE TO RESPECT YOU • No ads, no subscriptions, no paywalls — the whole game is free • No account, no sign-up — your progress lives on your device • No data collected. Period. • Works completely offline Pick up Zenoku for two minutes or two hours. The puzzle is waiting — and nothing else is.