Nonograms Katana: Sharpen your mind!

Nonograms, also known as Hanjie, Griddlers, Picross, Japanese Crosswords, Japanese Puzzles, Pic-a-Pix, "Paint by numbers" and other names, are picture logic puzzles in which cells in a grid must be colored or left blank according to numbers at the side of the grid to reveal a hidden picture. The numbers are a form of discrete tomography that measures how many unbroken lines of filled-in squares there are in any given row or column. For example, a clue of "4 8 3" would mean there are sets of four, eight, and three filled squares, in that order, with at least one blank square between successive groups.
To solve a puzzle, one needs to determine which cells will be boxes and which will be empty. Determining which cells are to be left empty (called spaces) is as important as determining which to fill (called boxes). Later in the solving process, the spaces help determine where a clue (continuing block of boxes and a number in the legend) may spread. Solvers usually use a dot or a cross to mark cells they are certain are spaces.
It is also important never to guess. Only cells that can be determined by logic should be filled. If guessing, a single error can spread over the entire field and completely ruin the solution.

- 1001 nonograms
- All puzzles are free
- All puzzles tested by computer program and have unique solution
- Black-and-white and colored
- Nonograms sorted by groups from 5x5 to 50x50
- Download puzzles sent by other users
- Create and share your own puzzles
- 15 free hints per puzzle
- Use crosses, dots and other symbols to mark cells
- Auto cross out numbers
- Auto fill trivial and completed lines
- Auto save; if you stuck you can try another puzzle and come back later
- Zoom and smooth scrolling
- Lock and zoom number bars
- Lock current puzzle state, check assumptions
- Customize background
- Optional cursor for accurate picking
- Undo and redo
- Share result pictures
- Save game progress to the cloud
- Achievements and leaderboards
- Screen rotation
- Suitable for phones and tablets

VIP Features:
- No Ads
- View Answer
- 5 extra hints per puzzle


What’s New

Version 11.111

- Modern iOS support
- Minor fixes
- Hotfix for iOS 9

Ratings and Reviews

4.8 out of 5
3K Ratings

3K Ratings

Urtinyfriend ,

Best nonogram by far

I did rare this 5 stars but I would like to see a change. Currently if you make a mistake you can’t tell it’s a mistake until it contradicts something else. And you can go back but you don’t know how far is necessary. You CAN check for ‘correctness’ but the way it does, I couldn’t figure out if it was right or not. It was corrected but I couldn’t tell what it affected. I’d like to see just a highlight of what is wrong and I’d like to correct it so I know what it affects. Also a clue to how many mistakes would be nice. I don’t want to keep playing if there are mistakes.

If there was a counter for number of mistakes and I could just go back till it was zero and figure it out myself, that would be ideal :)

I’ve tried many nonogram apps and this one is my favorite by far. There are others with adventure style play but this one is just simple and I like that.

ladybuggoddess ,


I’ve just now started to really get into doing nonograms bc this app was the best I’ve had for these puzzles, and I got up the courage to do some of my own and I absolutely loved the puzzles that I made bc they were overall cool to look at...but I made the mistake of thinking other people would think they were cool and published them... the result was comments on how they were boring to do and insulting my picture and making me feel like crap for even expressing my style... apart from already having three of my favorite puzzles completely deleted by the system bc there was other puzzles in the same category? I thought that’s what categories were for? (Did you know that?)...and so now they’re gone for good, not even there for me to see and keep. I am not happy with this disrespect and censorship. Seriously this app is a contradiction, you simply aren’t allowed make puzzles that other people don't find worth their time, but do it to begin with only to be snobbish towards you. I’m only keeping this app bc of my puzzles that got accepted and the fact that I enjoy and appreciate the puzzles that people took their time to share with others their style.

P.S. Don’t be miserable and make others feel bad for it.

purple bootyshorts ,

Best nonogram I’ve used

I’ve been downloading different nonogram apps for months and this one is by far the winner. I’m very picky with my games, so large amounts of ads before, after, and during puzzle time are a huge turn off. This app definitely doesn’t do that and I love it.

I like that I can choose which puzzles to do and that it gives me color choices, I don’t use them because I’m too busy concentrating on the puzzle, but it’s a cool feature nonetheless. I know there’s a VIP version of the game and I’m not sure what extra features it carries, but the free version works splendidly.

I definitely recommend it to anyone who wants to put their mind to the test.

App Privacy

The developer, Alexander Leontyev, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Contact Info
  • User Content
  • Identifiers

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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