# Tchisla: Number Puzzle

> Number puzzle game to express numbers using arithmetic expressions and digits 1-9. (iPhone/iPad app by HORIS INTERNATIONAL LIMITED.)

- Source: https://appshunter.io/ios/app/tchisla-number-puzzle/id1100623105 (this page in markdown: same URL + `.md`)
- Developer: [HORIS INTERNATIONAL LIMITED](https://appshunter.io/developer/646324304)
- Category: Games, Education, Puzzle
- Price: Free with in-app purchases
- Rating: 4.90/5 from 153 App Store ratings · 63 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 25 MB
- Languages: American English, Russian
- Released: 2016-07-07
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/tchisla-number-puzzle/id1100623105/reviews.md

## What is Tchisla?

Tchisla is a really absorbing number puzzle from the creators of Euclidea. Explore the magic world of numbers and train your mental arithmetic skills. All you need is to represent numbers as arithmetical expressions using only one of the digits from 1 to 9. This can be done in various ways. You gain more points if your solution uses fewer digits and sometimes your way to the optimal solution looks like an exciting quest.

You can use standard arithmetic operations +, -, *, /, and brackets, extract square roots (√), raise to a power (^), and apply factorials (!). The factorial (n!) is the product of all positive integers less than or equal to n.

For example:

96 = 99 - √9
96 = 4 * 4!
96 = 2 * 2 * (22 + 2)
96 = 111 - (1 + 1)^(1 + 1 + 1 + 1) + 1
2048 = ((5 + 5) / 5) ^ (55 / 5)

The idea is easy but it can be very hard to find the shortest solution. Try to solve 64#4 using 2 digits or 71#7 with just 3 digits. Here 64#4 means that you need to express 64 using only 4. When the solution is found, you can stop for a moment to take a look at the received formula and to enjoy and appreciate all the beauty of the mathematics.

*** More than just a calculator ***
Tchisla looks like an ordinary calculator but it is designed to help you in your fight with the problem. It proposes you autocomplete variants that can lead you to the goal. You choose the way and the app calculates and performs all the menial job for you. In short time you suddenly discover that you know a lot of numbers and their properties: factorials, squares, cubes, prime numbers, roots and others. Tchisla imperceptibly helps you to improve your calculating skills.

*** Game modes ***
* The Practice mode consists of a short tutorial and the most interesting problems to solve with numbers from 1 to 100.

* 2016 is the number of the year and one more mode. You need to express it with each digit from 1 to 9. Can you reproduce the world record? It uses totally 48 digits.

* In the Gallery, you can find a table of numbers and the count of digits used in solutions. You can solve new problems here and find solutions that can be improved. This will help in future challenges since they can be based on the levels that are already solved.

You can extend the standard Gallery up to 10000 (via in-app purchase). It will help you to track your progress and the current records and to get quick access to any number or solution. The Extended Gallery contains 50 sections with 200 numbers each (1800 exercises).

* The Contest mode is a regular competition between players. A number to be expressed is announced and you have just 24 hours to find the shortest solution for each digit. You win the gold medal if you have used the minimum number of digits. Do not lose your chance to become the first in the rating!

*** Gestures and controls ***
- swipe to the left to erase the expression
- swipe to the right to restore an existing solution
- double tap on the solution to switch between alternative variants
- yellow square with digit count means that nobody has found a shorter solution. Maybe, it is you who will break the record?

*** Why Tchisla ***
"Tchisla" is the Russian word for "numbers". With our app you will find out a lot of dependencies between numbers, discover their secrets, learn a lot of tricks to tame them or even become their friend. Numbers will become not just sets of digits for you.

*** Questions? Comments? ***
Send in your inquiries and stay up-to-date on the latest Tchisla news at http://www.euclidea.xyz/ and http://www.twitter.com/tchisla.

## Key features

- Represent numbers as arithmetic expressions
- Use digits 1-9
- Standard arithmetic operations (+, -, *, /)
- Advanced operations (√, ^, !)
- Practice mode with tutorial
- Competitive modes with leaderboards
- Gallery for tracking progress and solutions

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Extended gallery | $1.99 | one-time |


## Recent user reviews (10 of 63)

All indexed reviews: https://appshunter.io/ios/app/tchisla-number-puzzle/id1100623105/reviews.md

### 5/5 — Great puzzle, could use more gamifying

*2025-10-04, version 1.22*

I love all the apps from this developer. I love math puzzles because they’re a great brain workout. And Tchisla, like Euclidea and Pythagorea, have a beautiful design! I do wish they had some sound effects though. It sounds silly, but it makes a world of difference to complete a puzzle to a little magical chime as opposed stony silence. Make it a bit more “game like”.  An example would be the app “Eat Pi”. Just some optional sounds would make a world of difference, also when it gives me some text to read, I sometimes don’t notice it because there is no “text pop-up” sound. Highly recommended app.

### 2/5 — Great game but keeps crashing

*2025-08-28, version 1.22*

I love this game and spent a lot of time playing it several years ago (pre 2022, probably)! I just opened it back up again, and it has crashed at least 4 times in the last ~10 minutes. This is a pretty big issue for me as, after it crashes, I will have to remember and find the number I was working on again (and all the sub numbers I was working on in the progress of working on that number)

### 1/5 — Позор

*2025-08-16*

Ну выключите уже остатки своих серверов, которые не справляются с оставшимися клиентами. Как говорила бабушка, не можешь cрать - не мучай жoпy. И попрощайтесь достойно с оставшимися юзерами, а не как сейчас.

### 5/5 — Amazing

*2025-06-21, version 1.22*

Amazing game but how do you do 3 # 1 better that 3/3? Is it a mistake? Please tell me if it is 😭

### 3/5 — Great but No Support?

*2025-05-29, version 1.22*

Fantastic game for those that like the puzzle. But recently it seems the server isn't working for the daily "contest" puzzle. Either your number will be recorded wrong (I'll routinely have it say "your result 60, at time of contest close 62" it's always +2 for some reason) or it won't be recorded at all. Just stays at "-"
I play this game every day for years. Just takes a few minutes for the daily puzzle and then on to other things. Please update this issue.

### 2/5 — Update revoked yellow marks on solutions

*2025-05-22*

When swapping the phone and redownloading Tchisla from the App Store some of my 1#x Solutions (namely 2,3,4 and 9) are now considered non optimal (using the dullest two digit solution X/X) which is very irritating to say the least. Unless you hit the rounding error by stacking several dozen square roots I don‘t think there is a more optimal solution.

### 5/5 — 🔥

*2025-02-15*

2 через 9: факториал квадратного корня из 9 разделить на квадратный корень из 9 👌🏻

### 5/5 — great

*2024-12-05*

I downloaded every of their app like pythagorea and pythagorea60 or even euclidea and they are all very cool and the problems are interesting. This app stands out from their other apps because it uses numbers instead of geometrical figures and the puzzles ar entertaining.

### 2/5 — Потеряны результаты

*2024-11-25*

После вынужденной переустановки приложения мои результаты не подрузились из аккаунта Game Center. Было решено невероятное число задач с золотом. Хотя бы взять тот факт, что до 200 для всех цифр были золотые решения. 
Вся база решений утеряна. Поддержка даже не ответила. Интерес к игре потерян.

### 5/5 — Excelent

*2024-07-12, version 1.22*

Excellent game by an amazing company, please leave your products on the app store forever.

I'd like a harder mode for gallery where the hidden base 10 centric concatenation operation is turned off, and perhaps an extra hard gallery as well with factorial and square root single operation disabled.

I'm kind of amazed at how few of the puzzles need you to outside the 1 to 100 range as part of the optimal solution.

It certainly makes you appreciate how 2 (1 + 1) and 3 (1 + 1 + 1) are nearly all you need.

## Frequently asked questions about Tchisla

### What is Tchisla: Number Puzzle?

Tchisla is a number puzzle game where players represent target numbers as arithmetic expressions. You can only use digits from 1 to 9 and standard operations like addition, subtraction, multiplication, division, square roots, powers, and factorials. The goal is to find the shortest or most elegant solution.

### What are the key features of Tchisla?

Key features include representing numbers with arithmetic expressions, using a variety of mathematical operations, a practice mode with a tutorial, a '2016' mode, a gallery to track solutions, and a competitive contest mode. The app also offers an extended gallery via in-app purchase.

### How much does Tchisla cost?

The base app is free to download and play. There is an in-app purchase available to extend the Gallery mode, which offers more content and tracking capabilities. The game does not feature advertisements.

### What kind of math operations can I use?

You can use standard arithmetic operations (+, -, *, /), brackets, square roots (√), raising to a power (^), and factorials (n!). The factorial (n!) is the product of all positive integers less than or equal to n.

### Who is this app for?

This app is designed for anyone who enjoys number puzzles and wants to improve their mental arithmetic skills. It's suitable for players who like a challenge and appreciate the beauty of mathematics, from casual players to those seeking competitive gameplay.

## Version history (last 4 releases)

### 1.22 — 2017-02-08

This app has been updated by Apple to display the Apple Watch app icon.

• Fixed bugs.
NOTE. The first start of the updated app can take some time to verify all the solutions. The wrong ones will be deleted. 

If you enjoy Tchisla, please leave a nice review on the store. Happy solving!

### 1.17 — 2016-08-19

• Added Extended Gallery ($$) with numbers up to 10000.
• Improved accuracy of solution verification.
• Fixed bugs.

NOTE. The first start of the updated app can take some time to verify all the solutions. The wrong ones will be deleted. Please check your 16#7.
If you enjoy Tchisla, please leave a nice review on the store. Happy solving!

### 1.12 — 2016-07-23

• Added Contest Mode: new number to solve each day
• Added new leaderboards in Game Center
• Fixed bugs

If you enjoy Tchisla, please leave a nice review on the store.

### 1.09 — 2016-07-07

No release notes.

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## More apps by HORIS INTERNATIONAL LIMITED

- [Quick Route — A Puzzle That Requires Thought To Solve](https://appshunter.io/ios/app/quick-route-a-puzzle-that-requires-thought-to-solve/id882744410)
- [Euclidea](https://appshunter.io/ios/app/euclidea/id927914361)
- [Pythagorea](https://appshunter.io/ios/app/pythagorea/id994864779)
- [Pythagorea 60°](https://appshunter.io/ios/app/pythagorea-60/id1043064990)
- [XSection](https://appshunter.io/ios/app/xsection/id1069933287)

All apps by HORIS INTERNATIONAL LIMITED: https://appshunter.io/developer/646324304

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*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.*