Sudoku
Classic Sudoku. A calm puzzle with optional help.
Sudoku is a native Android puzzle game built for quiet, classic 9×9 play. Work through a 90-level campaign across three worlds — Beginner Garden (Easy), Logic Valley (Medium), and Master Peak (Hard) — then keep going with generated Practice puzzles. A Daily Challenge (one puzzle per UTC day, no timer) builds a streak. Notes, undo/redo, and erase are always available. Optional AI Coach explains why a number fits without filling it in, and optional Hints walk house → cell → digit. Progress, the current puzzle, and stats save on the device as you play. Core play works fully offline. Sign in with Play Games only if you want progress and achievements on other devices. Purchases and ads are optional — you can keep playing without buying anything. There is no app-specific login, no cloud AI that sees your board, and no banner ads; rewarded video is available only when you choose to watch for an extra Hint or Coach tip.
What makes it special
90-Level Campaign
Three worlds of 30: Beginner Garden (Easy), Logic Valley (Medium), and Master Peak (Hard). After level 90, Practice generates Hard puzzles.
Daily Challenge & Streaks
One puzzle per UTC day with no timer. Hints stay optional. Completing dailies builds a streak.
Classic Tools
Notes, undo/redo, and erase on a standard 9×9 grid. Leave and come back — the puzzle is waiting.
Optional AI Coach
Points at a house or technique and explains why a number fits. It never fills the digit. Coach language is on-device templates — the grid is never sent to a cloud LLM.
Optional Hints
One credit runs a three-step ladder: highlight the house, then the cell, then reveal the digit. Three free Hints and three free Coach tips refresh each UTC day.
Offline-First Play
Core play works without a network. Network is used only for ads, purchases, and optional Play Games sync.
Optional Play Games
Sign in to sync campaign progress, stats, daily results, and in-progress puzzles. Hint/Coach balances and purchases stay with the device and Google Play.
Optional Store
Free to download. Optional one-time packs for Hints, Coach tips, or Remove Ads. You can keep playing without buying anything.
Built with the best tools
Every technology choice was made with scalability, performance, and maintainability in mind. Here's what powers Sudoku.
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