# Nonograms Katana — Sharpen your mind!

> Logic picture puzzles where numbers reveal hidden images. (iPhone/iPad app by Ucdevs Interaction DOO.)

- Source: https://appshunter.io/ios/app/nonograms-katana/id1037710023 (this page in markdown: same URL + `.md`)
- Developer: [Ucdevs Interaction DOO](https://appshunter.io/developer/1037710022)
- Category: Games, Puzzle
- Price: Free with in-app purchases
- Rating: 4.83/5 from 6,646 App Store ratings · 338 written reviews indexed
- Age rating: 12+
- Requires: iOS 14.0 · 27 MB
- Languages: Czech, Dutch, English, French, German, Italian, Japanese, Korean, Polish, Portuguese and 5 more
- Released: 2015-09-15
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/nonograms-katana/id1037710023/reviews.md

## What is Nonograms Katana?

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.

Features:
- 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

The Guild Expansion:
Welcome to the Adventurers Guild!
By solving puzzles, you will get loot and experience.
You will have weapons that allow you to deal with puzzles much faster.
You will be able to complete quests and receive a reward.
You will have to rebuild the settlement and collect the lost mosaic piece by piece.

The Dungeon Expansion:
Game in a game in a game.
Isometric turn-based RPG.
What adventurer doesn't dream of exploring a dungeon?

site: https://nonograms-katana.com
facebook: https://www.facebook.com/Nonograms.Katana

## Key features

- 1001 nonogram puzzles
- Create and share custom puzzles
- Black-and-white and colored puzzles
- Puzzles sorted by size
- Hints and undo/redo functionality
- Cloud save and achievements

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| VIP version | $2.99 | one-time |
| 80 Hints | $0.99 | one-time |
| 200 Hints | $1.99 | one-time |


## What do users think of Nonograms Katana?

Overall sentiment: positive

**Pros**

- 👍 Lots of puzzles
- 👍 Customizable settings
- 👍 Minimal ads
- 👍 Challenging puzzles
- 👍 User-created puzzles
- 👍 Satisfying to complete
- 👍 Relaxing gameplay
- 👍 Intuitive interface

**Cons**

- 🐛 Occasional crashes
- 🐛 Puzzle progress loss
- 🐛 Ads not working
- 🐛 Freezing issues
- 🐛 Compatibility problems
- 🔍 Lack of difficulty ratings
- 🔍 Small buttons/controls

**Commonly reported bugs**

- Puzzle progress not saving
- Puzzle images not loading
- Freezing/crashing on larger puzzles
- Ads not playing properly
- Compatibility issues with newer iOS versions

**Most requested features**

- Dark mode option
- Ability to rearrange/move puzzle pieces
- Difficulty ratings for puzzles
- Automatic line/row completion
- Ability to follow/subscribe to users
- Notification system for new puzzles
- Diagonal line drawing tool

## Recent user reviews (10 of 338)

All indexed reviews: https://appshunter.io/ios/app/nonograms-katana/id1037710023/reviews.md

### 5/5 — Great fun, well implemented

*2026-08-18, version 21.300*

This is great! So many customisable options and it’s the best app for Nonograms around. 

At only $5 to remove ads (very short ads by the way) the amount of content is amazing. Good social features too if you’re into that. 

Regardless, you can play other Nonograms created by other uses. Literally thousands and thousands to play through. 

I can’t imagine doing some of the bigger ones (above 25 rows/columns) on phone, but the pinch in/out and move is easy and intuitive. 

I think I’ll get a ton of use and fun out of this app! And I would recommend it to anyone. It has its high ratings in the App Store for a reason! 

Get it today, you won’t regret it.

### 1/5 — Too many Temu ads

*2026-08-10, version 21.300*

The ads are nothing but Temu which I can’t stand anymore. I got a virus because of those ads. Get rid of all of them right now!

### 5/5 — Very relaxing

*2026-08-08, version 21.300*

Only usually the odd short advert.

### 3/5 — One thing

*2026-08-03, version 21.300*

Please please please let me cross vertical and horizontal arrows

### 5/5 — Thank you

*2026-07-17, version 21.300*

Ever since my mom got this app for me I have fallen in love with it

### 5/5 — look no further

*2026-07-06, version 13.120*

Truly just the best nonogram app. Been playing this (or addicted) for 5 years now. The community feature is so good, endless large scale nonograms!

### 5/5 — Best nonogram app

*2026-07-05, version 13.120*

First, it’s a great app.  Challenging — you can pick your difficulty — and fun, with lots of content.  No doubt good for my brain.

They do a great job with ads.  Ads are fine; the developers deserve to make a profit.  Too many apps allow ads you can’t delete or are replaced by more ads.  (I’ve uninstalled enough of them.). Not here.  The ages are short — so much so that I actually watch them — and do not interrupt play.  It’s almost like they want you to enjoy the program.

### 3/5 — Really good game but latest update…

*2026-07-02, version 13.120*

I love this game and really helps me relax. However I have come across some bugs in the last few days. For some reason the game crashes when I open it. I have closed and opened it and uninstalled which helped temporarily nut then it wipes all my settings so I have to redo all the settings so it matches my play style. Why can’t this be linked to your account?

Please fix these issues because I really enjoy this game

### 4/5 — Better filtering would be nice

*2026-06-20, version 13.120*

Overall quite good, but I wish filtering functionality were better. It’s not clear how the filter toggle buttons interact—it would be great to have explicit include/exclude or and/or control. 

I would also love to be able to filter size by one dimension. On mobile, I much prefer tall/narrow puzzles to short/wide, and I’m not aware of any way to specify that (such as max width). A second-best capability would be a rotate/transpose option.

### 4/5 — Nearly perfect

*2026-06-20, version 13.120*

Great variety of puzzles and levels of complexity. I was happy to pay for full version and I use my Apple Pencil to accurately tap on the squares.
On the larger grids it would be helpful if I could tap on one row/column and the whole line be highlighted so it’s easier to count/mark the squares.

## Frequently asked questions about Nonograms Katana

### What are Nonograms?

Nonograms, also known as Hanjie or Griddlers, are picture logic puzzles. You fill cells in a grid based on numerical clues on the sides to reveal a hidden image. The numbers indicate sequences of filled cells in each row or column.

### What kind of puzzles does Nonograms Katana offer?

The app features 1001 nonogram puzzles, available in both black-and-white and colored versions. Puzzles are sorted by size, ranging from 5x5 to 50x50, and all are tested to have unique solutions.

### Is Nonograms Katana free to play?

The core game with all 1001 puzzles is free. There are optional VIP features available for purchase, such as ad removal, viewing the answer, and extra hints.

### Can I create my own puzzles?

Yes, you can create and share your own nonogram puzzles with other users. This feature allows for an endless supply of new challenges and the ability to test your puzzle-making skills.

### What tools are available to help solve puzzles?

The app provides 15 free hints per puzzle, along with tools like crosses, dots, and other symbols for marking cells. It also includes features like auto cross-out numbers and auto-fill for completed lines to aid in the solving process.

## Version history (last 5 releases)

### 21.300 — 2026-07-07

Adventurer's Guild and Dungeon expansions

### 13.120 — 2025-11-26

13.1
- Modern iOS support
- Minor fixes

### 13.110 — 2025-11-18

13.1
- Modern iOS support
- Minor fixes

### 13.1 — 2025-11-10

- Modern iOS support
- Minor fixes

### 13.0 — 2024-11-01

13.0
- Themes for a puzzle list (the old theme can be set in the game settings)
- Auto downloading of previously completed puzzles (After reinstall, etc.)
- Series: new sorting "Rating / Number of episodes", now it's default
- New options: Snap preview to number bars, snap preview in edit mode
- Tap the preview to scroll the puzzle to the specific location (Works only if both number bars are locked. Better with a stylus.)
- My Nonograms: option to use a secondary English name instead of a local name (default for English speaking users)
- Minor fixes

## Apps similar to Nonograms Katana

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Nonogram Color:Picture Cross](https://appshunter.io/ios/app/nonogram-colorpicture-cross/id1543830420) | 4.7 (1,252) | Free | Games |
| [Picture Cross Color](https://appshunter.io/ios/app/picture-cross-color/id1547974558) | 4.7 (8,903) | Free | Games |
| [Nonogram.com Color: Logic Game](https://appshunter.io/ios/app/nonogramcom-color-logic-game/id1516617231) | 4.7 (25,467) | Free | Games |
| [Nonogram.com - Number Games](https://appshunter.io/ios/app/nonogramcom-number-games/id1452992954) | 4.6 (194,213) | Free | Games |
| [Nonogram - IQ Logic Pic Puzzle](https://appshunter.io/ios/app/nonogram-iq-logic-pic-puzzle/id867654947) | 4.4 (9,199) | Free | Games |
| [Picture Cross](https://appshunter.io/ios/app/picture-cross/id977150768) | 4.6 (74,344) | Free | Games |

## Related topics

[nonograms katana](https://appshunter.io/ios/topics/nonograms-katana) · [katana](https://appshunter.io/ios/topics/katana) · [hanjie](https://appshunter.io/ios/topics/hanjie) · [nonograms](https://appshunter.io/ios/topics/nonograms) · [nonograms colored](https://appshunter.io/ios/topics/nonograms-colored) · [picross](https://appshunter.io/ios/topics/picross) · [cross me](https://appshunter.io/ios/topics/cross-me) · [nomogram](https://appshunter.io/ios/topics/nomogram) · [nonagram](https://appshunter.io/ios/topics/nonagram) · [bring it now customer](https://appshunter.io/ios/topics/bring-it-now-customer) · [nonogram no ads](https://appshunter.io/ios/topics/nonogram-no-ads) · [hungry cat picross](https://appshunter.io/ios/topics/hungry-cat-picross) · [picross 3d](https://appshunter.io/ios/topics/picross-3d) · [nonogram color](https://appshunter.io/ios/topics/nonogram-color) · [picture cross](https://appshunter.io/ios/topics/picture-cross) · [colour nonograms](https://appshunter.io/ios/topics/colour-nonograms) · [nonogram puzzle](https://appshunter.io/ios/topics/nonogram-puzzle) · [nonograms clor](https://appshunter.io/ios/topics/nonograms-clor) · [picross luna](https://appshunter.io/ios/topics/picross-luna) · [griddler](https://appshunter.io/ios/topics/griddler)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*