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a clean sudoku app

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- - bug_report.md
  - feature_request.md
- - build-android.yml
  - build-ios.yml
  - build-macos.yml
  - build-windows.yml
  - deploy-web.yml
  - release.yml
- PULL_REQUEST_TEMPLATE.md
- - build.gradle.kts
  - proguard-rules.pro
- .gitignore
- build.gradle.kts
- gradle.properties
- settings.gradle.kts
- - icon.png
- - hive_boxes.dart
- - board_notifier.dart
  - difficulty_provider.dart
  - game_notifier.dart
  - info_provider.dart
  - services_provider.dart
  - settings_provider.dart
  - stats_provider.dart
  - theme_provider.dart
- main.dart
- - CMakeLists.txt
  - generated_plugin_registrant.cc
  - generated_plugin_registrant.h
  - generated_plugins.cmake
- - CMakeLists.txt
  - main.cc
  - my_application.cc
  - my_application.h
- .gitignore
- CMakeLists.txt
- - Flutter-Debug.xcconfig
  - Flutter-Release.xcconfig
  - GeneratedPluginRegistrant.swift
- - AppDelegate.swift
  - DebugProfile.entitlements
  - Info.plist
  - MainFlutterWindow.swift
  - Release.entitlements
- - project.pbxproj
- - contents.xcworkspacedata
- - RunnerTests.swift
- .gitignore
- - sudoku.desktop
  - sudoku.png
- snapcraft.yaml
- - fake_services.dart
  - puzzle_strings.dart
  - stat_records.dart
  - sudoku_grids.dart
- - board_notifier_test.dart
  - game_notifier_test.dart
  - services_provider_test.dart
  - stats_provider_test.dart
- - Icon-192.png
  - Icon-512.png
  - Icon-maskable-192.png
  - Icon-maskable-512.png
- _headers
- favicon.png
- index.html
- manifest.json
- robots.txt
- - CMakeLists.txt
  - generated_plugin_registrant.cc
  - generated_plugin_registrant.h
  - generated_plugins.cmake
- - CMakeLists.txt
  - flutter_window.cpp
  - flutter_window.h
  - main.cpp
  - resource.h
  - runner.exe.manifest
  - Runner.rc
  - utils.cpp
  - utils.h
  - win32_window.cpp
  - win32_window.h
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analysis_options.yaml
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LICENSE.txt
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A cross-platform Sudoku app built with Flutter. Generates unique puzzles with varying difficulty using logical solving techniques

![Website](https://img.shields.io/website?url=https%3A%2F%2Fsudoku.likhithpraveenk.com&style=for-the-badge)
![F-Droid Version](https://img.shields.io/f-droid/v/com.likhithpraveenk.sudoku?style=for-the-badge)
[![GitHub Version](https://img.shields.io/github/v/release/likhithpraveenk/sudoku.svg?label=GitHub&style=for-the-badge)](https://github.com/likhithpraveenk/sudoku/releases)
[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg?style=for-the-badge)](https://www.gnu.org/licenses/gpl-3.0)

[<img src="https://raw.githubusercontent.com/likhithpraveenk/storii/main/assets/get-it-on-fdroid.png" alt="Get it on F-Droid" height="50">](https://f-droid.org/packages/com.likhithpraveenk.sudoku)
[<img src="https://raw.githubusercontent.com/likhithpraveenk/storii/main/assets/get_it_on_github_badge.png" alt="Get it on GitHub" height="50">](https://github.com/likhithpraveenk/sudoku/releases/latest)
[<img src="https://raw.githubusercontent.com/likhithpraveenk/storii/main/assets/badge_obtainium.png" alt="Get it on Obtainium" height="50">](https://apps.obtainium.imranr.dev/redirect.html?r=obtainium://add/https://github.com/likhithpraveenk/sudoku)

## Features

- **Difficulty** - difficulty is derived from the techniques required to solve a puzzle (Hidden Single, Naked Pair, X-Wing, Swordfish, …)
- **In-game assists** - notes/pencil marks, auto-notes, undo, conflict highlighting, and validation
- **Statistics & leaderboard** - track solve times per difficulty, with a top-10 board on the solved overlay
- **Resume** - the current game is persisted locally so you can continue where you left off
- **Theming** - light/dark and custom color themes with a live preview
- **Responsive layout** - adapts controls placement for phone and larger screens

## Screenshots

|                                                                                                          |                                                                                                |                                                                                             |                                                                                               |
| :------------------------------------------------------------------------------------------------------: | :--------------------------------------------------------------------------------------------: | :-----------------------------------------------------------------------------------------: | :-------------------------------------------------------------------------------------------: |
| <img src="metadata/android/en-US/images/phoneScreenshots/1.png" width="200" alt="mid-game sudoku board"> | <img src="metadata/android/en-US/images/phoneScreenshots/2.png" width="200" alt="home screen"> | <img src="metadata/android/en-US/images/phoneScreenshots/3.png" width="200" alt="settings"> | <img src="metadata/android/en-US/images/phoneScreenshots/4.png" width="200" alt="statistics"> |

## Architecture

The codebase follows a layered design:

- `lib/domain/` - pure Sudoku logic: models, solving techniques, solver, generator, and the `GameEngine` that owns all in-game mutations
- `lib/data/` - persistence layer (Hive boxes and save/load services).
- `lib/providers/` - Riverpod providers that wire domain and data together
- `lib/presentation/` - widgets, screens, and presentation-only models

## Getting Started

```bash
flutter pub get
flutter run
```

## Testing

```bash
flutter test
```

## AI Policy

This project was developed with the assistance of LLMs and coding agents. They were used for scaffolding and implementing Sudoku solving techniques. All AI-generated changes were reviewed by me before being committed

## License

Sudoku is licensed under the [GNU General Public License v3.0](LICENSE.txt).

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
```

sudoku

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