Sudoku Isle - Number Puzzle

A clean, modern Sudoku experience. Choose from four difficulty levels, solve puzzles at your own pace, and use smart hints that actually teach you the technique when you're stuck.

FEATURES
- Four difficulties: Easy, Medium, Hard, and Expert - every puzzle has a unique solution
- Daily Challenge: everyone in the world gets the same puzzle each day; build your streak and catch up on missed days from the calendar
- Global leaderboard: submit your score and see how you rank
- Teaching hints: learn Naked Singles, Hidden Singles, and more with clear explanations
- Undo and redo, notes with auto-fill, and auto-removal of stale notes
- Statistics: win rate, best time, and streaks per difficulty
- Flexible settings: Auto-Check, mistake limit, timer, sounds, and highlighting
- A single one-time purchase removes all ads forever - no subscription

Track your time, challenge yourself with harder levels, and enjoy the satisfaction of a completed grid. Simple, elegant, and endlessly replayable.