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9 Digits

By Ivonne Engemann and Marcus Wagner.

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I helped the great folks at 9digits.de redesign their Sudoku app, which also supports X-Sudoku, Killer Sudoku, and MathDoku, with hundreds of puzzles.

My favorite things about it are the super smart hint system, which actually helps you improve as a player, and the unique and very effective input system.

You can find more information at their website.