Niner - Daily Sudoku Puzzle Live

Niner is a beautiful, calm sudoku for people who love the puzzle — not the ads, pop-ups, and telemetry that clutter so many other apps. Open the app. Solve today's puzzle. Close the app. That's the loop. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHAT'S INSIDE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ◆ One daily puzzle — same one for everyone, every day ◆ Five difficulties — Beginner, Easy, Medium, Hard, Expert ◆ Five modes — Classic, Strict, Coach, Speed, Killer ◆ 16 achievements, from your first win to "Cage Master" ◆ Daily-streak tracking with a 12-week activity heatmap ◆ Best-time tracking per difficulty + per mode ◆ Five colour themes, each with a hand-tuned dark variant ◆ Six celebration styles, including one minimal option for people who don't want confetti ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ GAME MODES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Classic — the standard experience. Three mistakes, a handful of hints, all the time in the world. Strict — one mistake and it's over. For players who want their accuracy to actually matter. Coach — unlimited hints and mistakes. For learning, or for kids who are just starting out. Speed — race yourself. Your time is the score, and every second counts. Killer — cages with target sums layered on top. A fresh twist for when you want something new. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ DESIGNED FOR FOCUS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ◆ No ads. None. Not even a "remove ads" upsell. ◆ No account. No login. No email address required. ◆ No internet permission. Niner literally cannot phone home. ◆ No third-party SDKs — no analytics, no trackers, no crash reporters. ◆ No dark patterns — no push notifications nagging you to come back. Your progress lives on your device, in one tidy SharedPreferences file. Uninstall the app and it's gone — no cloud, no lingering data. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ THOUGHTFUL TOUCHES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ◆ Wrong entries don't get stuck on the board — they shake and vanish. Your board always reflects what you know. ◆ Peer and same-digit highlighting make hard puzzles manageable without making easy ones boring. ◆ Colour-blind palette option for hints and errors. ◆ Large-text toggle for easier reading. ◆ Centered-notes toggle if you prefer a single-row pencil-mark style. ◆ The daily puzzle is deterministic — if you compare notes with a friend, they had the same puzzle you did. ◆ Adaptive launcher icon, proper dark mode, tasteful haptics. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FOR EVERY LEVEL ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ New to sudoku? Start on Beginner with Coach mode — unlimited hints and mistakes, with explanations. Work up from there. Returning player? Skip straight to Expert or try Speed mode to see how fast you can go. Just want a daily ritual? The daily puzzle is a fixed Medium difficulty — one puzzle, a few minutes, no decisions. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BUILT WITH CARE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Kotlin, Jetpack Compose, Material 3. Puzzle generator runs on-device with a proper uniqueness check, so every puzzle has exactly one solution. No pre-bundled puzzle pack. Made by one developer, for people who love sudoku.