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