Sudoku – No Ads · Offline

About this game

Sudoku is a clean, offline sudoku game with no ads, no subscriptions, and no internet required. Pay once. Play forever. ━━ WHY THIS SUDOKU ━━ Most sudoku apps are free — and then charge you with ads every 30 seconds, push notifications, or a premium paywall after level 10. Sudoku is $1, ad-free by design, and fully playable without a network connection. ━━ 10 DIFFICULTY LEVELS ━━ From Beginner to Insane, each difficulty uses real solving technique thresholds — not just random given counts. You'll notice the difference. - Beginner – lots of givens, pure logic - Easy – simple singles - Medium – mixed techniques - Hard – naked pairs and triples - Expert – X-Wings and Swordfish - Master – full advanced toolkit - Legend – near-minimal givens - Nightmare – solver's gauntlet - Grandmaster – virtually no hints possible - Insane – extreme techniques required ━━ SMART HINT SYSTEM ━━ The 4-tier hint algorithm works like a human solver: Full House → Naked Single → Hidden Single → Minimum Remaining Values fallback. It teaches you the next logical step instead of just filling in a cell. ━━ FEATURES ━━ - Pencil marks / notes — toggle per cell, auto-cleared on correct placement - Undo / redo — full move history - Configurable mistake limits — per difficulty - Configurable hint limits — per difficulty - Auto-save — game restores exactly where you left it - Continue Game — resume from the home screen - Statistics — win rate, best time, average time per difficulty - Dark mode — Light / Dark / System theme - Offline-first — all data stored locally, no account needed - No analytics, no tracking, no third-party SDKs ━━ OPEN SOURCE ━━ Sudoku is free and open-source software (GPL-3.0). The full source code is on GitHub. If you find a bug or want to contribute, pull requests are welcome. ━━ KEYWORDS ━━ sudoku, sudoku offline, sudoku no ads, sudoku puzzle, sudoku hard, sudoku expert, brain puzzle, number puzzle, sudoku dark mode, logic puzzle, ad-free sudoku, sudoku classic, sudoku free offline