Not Evil Sudoku 4+

Not Evil Sudoku is a clean, minimalist, ad-free sudoku app built natively for iPhone and iPad with a smooth, distraction-free experience and powerful solving tools. Whether you're a casual solver or a sudoku speed demon, there's a difficulty mode for you.

Got a competitive streak? Play daily challenges at a difficulty of your choice and see where you stack up against players across the world on the Leaderboard. The app tracks any assists used in the solve and stores them with your score. On the leaderboard you can see what tools other players used.

Optimized for a zen solving experience free from bloat and distraction. Got stuck on a puzzle? Shake your phone for hints and turn on move by move validation in settings to get immediate feedback on your solve.

Key features:
- Fully offline
- No ads
- Real-time move validation
- Shake for hints
- Leaderboards
- Easy, Medium, and Hard difficulty levels
- Light/Dark mode
- Stopwatch with Best Time tracking (can be hidden)
- Notes: Keep track of candidates
- Auto-clear Notes: removes candidate numbers automatically in row, column, and box
- Speed demon: Lock numbers and place them in multiple tiles at once
- Arithmophobia: Sudoku with letters
- Undo and restart support
- Daily streak tracking
- Daily reminder notifications
- Highlighter: tap a number to highlight all its instances on the board
- Themes to customize the interface (some require Pro)
- Alternate app icons (Pro)
- Charts and statistics (Pro): track solve speed over time and puzzle count by difficulty

Play the daily puzzle at your preferred difficulty for free without any limits on assists or game features. Upgrade to Pro with a one-time purchase to unlock unlimited games, detailed stats, more themes, and alternate app icons. Pro supports Family Sharing.