Stefan Heine Sudoku - moderate to difficult !

+++ Stefan Heine Sudoku Series +++ +++ As seen and heard in the press, radio, and TV — Now available as an app +++ Sudokus for everybody - moderate to difficult Puzzle fun guaranteed — With Stefan Heine's Sudoku apps! All puzzles in these series have been personally selected and checked by me. Each puzzle is guaranteed to have only one single solution, and I guarantee that you'll have a top-notch Sudoku experience: World-class puzzling fun to indulge connoisseurs! My Sudoku apps are created to have fun, puzzling away anywhere, anytime without adding to your luggage — whether on a train, at the beach, or on a plane — both online and offline! Special features: • 400 premium Sudoku puzzles, hand-sorted and hand-picked • Playable completely offline without internet • Optimised for smartphones and tablets • Available with extra large numbers on tablets • Sophisticated help feature for beginners • Highlighting feature for fields with the same values • Night mode for dark rooms • Notes for small auxiliary numbers • Achievements and ranking lists Who am I? I’m Stefan Heine and I'm Germany's best-known puzzle maker. I have been supplying over 300 newspapers and magazines from all over the world with brain teasers of all kinds for more than 20 years. I have been making Sudoku puzzles since 1999, and it is said that I’m the one responsible for their success in Germany. I created the puzzles for the German, Austrian, and American championships, and also for the World championships. I advise television shows and agencies on issues related to puzzles, manage puzzle magazines, design and develop games, give workshops, and create puzzle books for many publishers. I do what I can do best: Puzzles, puzzles, puzzles! Sincerely, Stefan Heine