Last updated on November 28th, 2025 at 08:00 pm
Tchisla: Number Puzzle – Education Game Review
Tchisla: Number Puzzle is a Education/Puzzle game from HORIS INTERNATIONAL LIMITED, first launched in 7th July 2016.
It’s rated 4+ and currently has 145+ ratings on the App Store.
What Makes Tchisla: Number Puzzle Stand Out
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
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The Practice mode consists of a short tutorial and the most interesting problems to solve with numbers from 1 to 100.
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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.
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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.
This Education game offers engaging gameplay and regular updates for mobile players.
Player Feedback
As a newer release, Tchisla: Number Puzzle is building its player community. Early feedback suggests .
Recent Updates & Development
Latest Update: 8th February 2017
Recent improvements include:
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!
Download & Availability
Tchisla: Number Puzzle is available through the official App Store for iOS devices.
Get Tchisla: Number Puzzle on App Store
Requirements: Requires iPhone 5s / iPad Air / iPad Air (Cellular) / iPad Mini 2 (Retina) / iPad Mini 2 (Retina, Cellular) / iPhone 6 / iPhone 6 Plus / iPad Air 2 / iPad Air 2 (Cellular) / iPad Mini 3 or later.
Compatible with iPhone and iPad devices.
Player Experience Highlights
Community Insight:
We love all the apps from this developer. We love math puzzles because theyre a great brain workout. And Tchisla, like Euclidea and Pythagorea, have a beautiful design! We 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 us some text to read, we sometimes dont notice it because there is no text pop-up sound. Highly recommended app.
Amazing game but how do you do 3 # 1 better that 3/3? Is it a mistake? Please tell us if it is.
Even the lowest rate is a 3 star.
Very fun arithmetic game. It kind of bothers us how you can do square roots and factorials for free, but not say cube roots or logarithms, seems arbitrary. Still 10/10 though.
HIU makes the most elegant teaching / brain training apps we've ever seen. Really unique company, and we pray they continue to make more in the future.
Horus International : Mathematics :: Zach Gauge : Words. This serves up some delectable mathematical exercise without the surreally strange functions of Devils Calculator.
Worth downloading for people who like math. Fun to use in downtime.
Addictive. Simple, effective user interface. Free. No ads. We think Im happy that it doesnt tell you the optimal count unless/until you achieve it. We suppose we could dream up some bells and whistles to ask for, but it seems nearly perfect as is.
We love how easy it it so play this game, and we love these puzzles.
Feedback: we would prefer to see the numbers we have created, rather than the current hints. For example: For 30#7 we would see a list of 1,2,4,10,11,14,19,24,29 Because we have already created those numbers from 7.
This game is especially good to us, one is the fact that all contents are unlocked, and the extension is to provide easier access to user. Another is that it is ad-free, so you would never need to stop thinking of what you like.
The older we get, the more we appreciate apps like this pushing and expanding our thinking. This is a GREAT brain game for lack of a better way to put it! Thank you very much for this and please keep it updated, this app has become another favorite of ours.
This takes us back. When we were in high school, many years ago, we had a competition each year to create all the integers from 1 to 100 using just the digits of the year and the same basic operations as in Tchisla (1991 was a tough year). This also reminds us of the 4 Fours puzzle: create as many numbers as you can using only 4 4s. We love this take on the classic puzzle.
We have played number puzzles before, and really like this one because we can do one or two and put it down. Or stay a while and play at one or another for a shorter solution. It would be better if we could see some of our previous ideas.
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 (we'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 "-" we 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.
We wanted to like this game but we literally got stonewalled on the third tutorial level. At first it gave us purple diamonds with exclamation points, which we guess means we did it wrong. But then we put in equivalent length equations which we guess means we did it "right". But even then, it would force us to come up with more and more answers on the same single level. We had a stack of like 6 equations on that single level and just gave up. We have no idea what it was looking for and there is no tutorial to explain this behavior, either the purple diamonds or the stacking and stacking of more expected answers on a single level.
We love this game and spent a lot of time playing it several years ago (pre 2022, probably)! We 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 us as, after it crashes, we will have to remember and find the number we were working on again (and all the sub numbers we were working on in the progress of working on that number).
Who'd've thought that you could make such a good game about dynamic programming.
We've been playing it all day since downloading it.
User feedback from Apple App Store
App Details
- Version: 1.22
- Size: 24.96 MB
- iOS: 8.0 or later
- Languages: EN, RU
- Content Advisory:
- Developer: HORIS INTERNATIONAL LIMITED
Last updated: 8th February 2017 | Genre: Education, Puzzle | Developer: HORIS INTERNATIONAL LIMITED