Grid Logic is a free Android app with Sudoku and Nonogram puzzles generated on the phone, each with one solution, plus a daily pair. Offline.
| Price | Free, with ads. No in-app purchases |
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| Ads | A banner on the home, statistics and Puzzle solved screens and an occasional full-screen ad after a solved puzzle when you move on; an optional video gives an extra hint; never ads on a puzzle you are playing. |
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| Account | No account or sign-up |
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| Works offline | Puzzle generation, all difficulties and sizes, the daily puzzles and statistics work without internet; only ads need a connection. |
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| Permissions | Internet - to load ads and to open the privacy page or support e-mail when you tap them; Network state - added by the Google ads SDK to check for a connection before loading ads; Advertising ID - added by the Google ads SDK to show and measure ads; Wake lock, foreground service and ad-services entries - merged in by the Google ads SDK, not used by the game; No vibration permission: haptics use the phone's built-in feedback |
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| Your data | The app itself sends nothing and has no server or account; only the Google AdMob SDK sends data (advertising ID, IP address, device and app info, ad interactions) to show and measure ads. |
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| Storage | Unfinished puzzles, statistics, streaks and settings stay in the app's private storage on the phone; uninstalling deletes them. |
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| Requires | Android 7.0 or later |
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| Developer | GlowVibe |
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| Updated | 2026-10-24 |
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Sudoku and Nonogram puzzles in one app, freshly made on your phone every time you play.
Grid Logic has Sudoku in four difficulties and Nonogram picture puzzles in three sizes. Every puzzle is generated on the device the moment you ask for it, so you will not run out, and every one has exactly one solution.
Sudoku
- Fill the 9 x 9 grid so that every row, column and 3 x 3 box holds 1 to 9 once
- Easy, Medium, Hard and Expert. Easy to Hard are checked by a solver that thinks like a person: Easy needs only single steps, Medium needs pairs or pointing, Hard needs triples or wing patterns, and none of them needs a guess. Expert Sudoku has the fewest clues and may ask for deeper reasoning
- Pencil notes, undo and redo, erase, and highlighting of the selected row, column, box and number
- Each number key shows how many of that number are still to place
Nonogram
- The numbers beside each row and above each column are the runs of filled squares in that line. Work them out and a picture appears
- 5 x 5 for a quick warm-up, 10 x 10 for the classic size, 15 x 15 for a longer think
- Tap to fill, switch to Cross to mark squares you know are empty, or drag to mark a whole stretch at once
- Pinch to zoom on big grids; the clues stay beside the grid while you move around
- Every nonogram puzzle can be solved one line at a time, without guessing
Daily sudoku and nonogram
A daily Sudoku (Medium) and a daily 10 x 10 Nonogram, the same for every player on that date. Solve them on consecutive days to build a streak for each.
Help when you are stuck
- Hint reveals one correct square and, when it can, tells you why ("this is the only place for 7 in its row")
- The first hint in every puzzle is free. More hints are offered for a short optional video
- Check marks wrong squares in red, or switch on "Show mistakes" to see them as you go
Your progress
- A clock for every puzzle that pauses when you leave the app
- Puzzles are saved as you play, so you can close the app and carry on later
- Statistics: puzzles solved, best and average times for every difficulty and size, and your daily streaks
Comfortable to play
- Large grid and keys, also on small phones; grid and keys sit side by side when the phone is turned
- Light and dark themes, optional vibration, and settings for highlighting and crossing out finished lines
Sudoku offline, nothing leaves your phone
No account and no sign-up. These logic puzzles work offline, without an internet connection (ads need one), so Sudoku and Nonogram are there on a plane or in the underground. Your statistics are kept on your phone only.
Grid Logic is free and contains ads: a banner on the menu, the statistics and the "Puzzle solved" screen, and an occasional full-screen ad after a solved puzzle when you move on. There are never ads on a puzzle you are playing, and videos only play if you choose to watch one for an extra hint.
Frequently asked questions
Is there a Sudoku app that works offline with no account?
Grid Logic makes Sudoku puzzles on your phone, so it works fully offline with no account or sign-up. It has Easy, Medium, Hard and Expert, and every puzzle has exactly one solution.
What is a good app for Nonogram picture puzzles?
Grid Logic has Nonogram picture puzzles in 5 x 5, 10 x 10 and 15 x 15, generated on the phone. Every one can be solved a line at a time without guessing, and you can fill, cross or drag to mark.
Is there a Sudoku app with hints that explain the next step?
Grid Logic's Hint reveals one correct square and, when it can, says why, for example that it is the only place for 7 in its row. The first hint in every puzzle is free.
Is Grid Logic free?
Grid Logic is free and contains ads: a banner on the menu, statistics and Puzzle solved screens and an occasional full-screen ad after a solved puzzle. No in-app purchases; extra hints are optional with a short video.
Does Grid Logic have a daily puzzle?
Yes. Grid Logic has a daily Medium Sudoku and a daily 10 x 10 Nonogram, the same for every player on the same date. Solve them on consecutive days to build a streak for each.
How is Grid Logic different from other Sudoku apps?
Grid Logic generates every puzzle on the phone, so you do not run out. Easy to Hard Sudoku are checked by a solver that uses human techniques, so none needs a guess, and it also includes Nonograms.
What data does Grid Logic collect?
Grid Logic itself collects nothing; unfinished puzzles, statistics and streaks stay on your phone. Only the Google AdMob SDK collects data such as the advertising ID to show ads.
