Open Sudoku: No Ads & Offline

600+ classic Sudoku puzzles, zero ads, zero paywalls. Play fully offline with pencil notes, progressive hints, six skill levels, and a native iPad layout.

Play classic Sudoku with no ads, no subscriptions, and no paywalls. Open Sudoku is a fast, private logic puzzle for iPhone and iPad that works fully offline—and every puzzle, hint, and feature is free.

PURE SUDOKU, COMPLETELY FREE • No banner, video, interstitial, or pop-up ads • No subscriptions, paid hints, lives, currencies, or locked puzzles • Optional tips support development but unlock nothing • Start instantly with 600 validated puzzles stored on your device

SIX LEVELS FOR EVERY SOLVER • Gentle: learn the board with approachable logic • Easy: build confidence with single-candidate techniques • Medium: practice pairs and pointing patterns • Hard: work through subsets and intersections • Expert: take on wings, fish, and deeper deductions • Master: follow long logical chains without guessing • Get 100 unique 9x9 puzzles at every level • Choose any difficulty immediately—there is no forced path, daily streak, or trophy grind

PLAY YOUR WAY • Six skill levels, from Gentle to Master • Cell-first or digit-first input • Pencil notes, optional auto-candidates, and automatic note cleanup • Unlimited undo and redo • Optional mistake checking with no three-strikes game over • Remaining-number counts and clear conflict highlighting • Pause and resume with progress saved automatically • Share a puzzle link and clean image with friends

LEARN THE LOGIC • Progressive hints point to an area, explain the technique, then reveal a number only if you ask • Study naked and hidden singles, locked candidates, pairs, X-Wing, XY-Wing, Swordfish, coloring, and logical chains • Open the built-in Learn guide for plain-language explanations of what to look for and why each technique works • No guessing required

MADE FOR IPHONE AND IPAD • Native, responsive controls • Dedicated iPad sidebar and landscape layout • Hardware keyboard shortcuts • Light, dark, high-contrast, and large-digit options • Accessible board actions and readable notes

MADE FOR QUICK BREAKS AND DEEP FOCUS Open Sudoku fits a five-minute relaxing puzzle as comfortably as a demanding expert session. Turn the timer or mistake checking on when you want feedback, or switch them off for a calm pencil-and-paper feel. There is no streak pressure and no punishment for taking your time.

PRIVATE, OFFLINE, AND IN YOUR CONTROL • Play without an account or internet connection • History and progress stay on your device by default • Voluntary private iCloud sync can be turned off • Optional Sign in with Apple is independent from gameplay • Puzzle pack updates are downloaded in the background and kept for offline play • No tracking

HOW TO PLAY CLASSIC SUDOKU Fill the 9x9 grid so every row, column, and 3x3 box contains the numbers 1 through 9 exactly once. Every included Sudoku has one valid solution. Use logic, pencil notes, and candidate elimination to solve the grid; no arithmetic is required.

FOR BEGINNERS, EXPERTS, ADULTS, AND SENIORS New players can learn Sudoku step by step with Gentle puzzles and progressive hints. Experienced solvers can jump directly to Hard, Expert, or Master grids. Large digits, high contrast, flexible input, and native iPad layouts keep the number puzzle clear and comfortable at any skill level.

Whether you want a relaxing beginner puzzle, a quick brain-training break, or a challenging Master grid, Open Sudoku keeps the experience calm, readable, and focused on logic.