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Behind the App
Sudoku+ was the app that taught me what “polished” really means in practice. Sudoku is arguably the most-solved puzzle type on mobile, which means the quality bar is set by years of user expectations shaped by dozens of well-funded competitors. Building in that space forced me to be deliberate about every single decision: why this grid size, why these difficulty labels, why this specific shade of highlight color.
The puzzle generation algorithm is something I’m genuinely open about. Generating a valid Sudoku is easy; generating one with a unique solution that’s achievable without guessing at a specific difficulty level is genuinely hard. The difficulty calibration in Sudoku+ is based on solving techniques rather than brute-force metrics — an “Easy” puzzle can be completed using only naked singles, while “Extreme” puzzles require advanced techniques like X-Wing and Swordfish. This is the kind of design decision that most players never consciously notice, but it’s exactly what creates the feeling of “fair challenge” that keeps people coming back.
I started Sudoku+ because I wanted a Sudoku app I’d actually use myself — one that was offline-first, had very few ads, and came with a tutorial complete enough for someone learning the game from scratch. The tutorial mode, which walks through techniques from basic to advanced, reflects the guide I wish I’d found when I first got serious about solving Sudoku. Building it was my way of giving back to the puzzle community while learning what it takes to ship something truly clean.
✔ Complete tutorial that shows you all the tricks to solve sudokus, valid for both beginners and experts.
✔ 5 perfectly balanced levels of difficulty: Easy, medium, hard, very hard and extreme
✔ More than 5,000 well-formed puzzles.
✔ 9x9 grid.
✔ Lots of different designs, choose your favorite.
✔ Unlimited Undo/Redo
✔ Auto-Fill Notes Option
✔ Auto-Clear Notes Option
✔ Advanced game options and notes
✔ Full game is free, with very few ads.
✔ Highlight duplicates to avoid repeating numbers in a row, column and block.
✔ Simple and intuitive design.
✔ No intrusive permissions.
✔ Sudoku + free includes advertisements to allow offering this game for free. The app itself can be used offline / without an internet connection!
👍 Challenge your brain with Sudoku+ anywhere and anytime! …
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Translations: María Llorens Ribes. Send an Email
Features
- Complete Tutorial: Shows you all the tricks to solve sudokus, valid for both beginners and experts.
- 5 Difficulty Levels: Perfectly balanced levels: Easy, medium, hard, very hard and extreme.
- More than 5,000 Puzzles: Well-formed puzzles on a 9x9 grid.
- Customization: Lots of different designs, choose your favorite.
- Tools:
- Unlimited Undo/Redo
- Auto-Fill Notes Option
- Auto-Clear Notes Option
- Highlight duplicates to avoid repeating numbers in a row, column and block.
- User Friendly: Simple and intuitive design with no intrusive permissions.
Sudoku+ free includes advertisements to allow offering this game for free.