Sudoku EyeCare

`Sudoku EyeCare` is not just a complete classic Sudoku app. It is built around a simple idea: solving puzzles should still feel comfortable during longer sessions.

Play standard `9x9` Sudoku with flexible difficulty levels, multiple input styles, notes, undo and redo, hints, daily challenges, and personal stats. Beginners can rely on layered hints and learning support, while experienced players can enjoy a stable puzzle library and a focused solving flow.

What makes the app different is its eye-comfort experience for night play, low-light environments, and extended sessions:

- Eye-care themes and a dark night theme
- Automatic night mode based on system settings or a custom time range
- Larger text, more readable candidate numbers, and bigger touch targets
- Softer highlights, gentler animations, lighter error feedback, and optional reduced vibration
- Focus mode to reduce visual noise around the board
- Lightweight `20-20-20` inspired eye break reminders
- Quick `15-30` second break pages that help users pause without losing progress
- Presets tailored for night comfort, long sessions, readability, and older users

`Sudoku EyeCare` is designed to be easy to start, rewarding to grow with, and comfortable enough to come back to every day.