Sudoooku

A Sudoku app that just does what it should — no ads, no pop-ups, no sign-up.

What's in it:

• Infinite puzzles — generated right on your iPhone, every one with exactly one solution • Three difficulty levels: Easy, Medium, Hard • Per-difficulty level system so you can see your progress • Notes, hints, and mistake highlighting — as much or as little help as you want • Timer and best times for each difficulty • Your current game saves automatically — close the app, pick it up later • Fully playable offline • Clean dark design with hand-drawn graphics • Available in English, German, French, Spanish, Italian, Portuguese, Dutch, Polish, Turkish, Russian, Japanese, Korean, and Chinese

What's not in it:

• Ads • In-app purchases • Tracking, analytics, accounts • Annoying reminders