Kluchi vs Summation
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Kluchi
This puzzle game challenges players to strategically place all keys onto a table. Utilize unique key connectors and special "neighbors" mechanics to solve increasingly complex arrangements. Hints are available to assist when you get stuck.
- Key placement puzzle
- Unique connector mechanics
- Special 'neighbors' keys
- Hint system
- Brain training benefits
- New puzzle type
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«Kluchi» - an exciting puzzle of a completely new type! The player's goal is to place all the keys in the table at the same time. It's easy to play! Just touch any item below the table, and the key by itself will fly upward. When the key is above the table, move it to the left or right to find a free space. If you see a locking icon on the key, it means that the place is busy or the key is behind the edge of the table. If there is no locking icon, simply release the key and it by itself will put in the table. Did you move all the keys to the table? - you solved the task! What do all these symbols mean? The key is a pair of items with connectors. Connectors talks how key's elements will be placed in the table relative to each other. - Triangular connectors indicate that the elements will be located in adjacent columns, but the first on the left, and the second on the right. - Rectangular connectors indicate that the elements will be in the table strictly in one column. - Round connectors say that the key's elements will be located in adjacent columns, but in advance it is not known in which order. This key is called "neighbors" and it's special: you can swap its elements. This affects its position in the table and the solution of the task as a whole. The button with the image of two arrows inverts all the "neighbors" located below the table. Be sure to try this button if the task has keys "neighbors" and you have something that does not work You can also use hints. The use of one hint leads to the fact that the game selects a random key, and puts it in the table correctly. The number next to the lamp icon says how many hint you have left. Hints are not free, but are not a necessary part of the game. Answers to the three most frequent questions: 1. The order of the elements in the table can be any. It is important only to put all keys to the table. 2. After solving the task, free cells can remain in the table. 3. Identical elements should be placed in the same cell of the table. After all, each element of the table is unique, and can meet in it only once. «Kluchi» is an interactive version of the my effective trainer for the brain «Genius Brain», and positively affects the following cognitive phenomena: - analytical and logical thinking; - accuracy and stability of thinking; - short-term and long-term memory; - concentration of attention; - iq, liquid intelligence; - imagination and creativity. If you have solved all the tasks in «Kluchi» and it is not enough for you, feel free to go to the «Genius Brain»: https://itunes.apple.com/app/id560072848 «Kluchi» is a truly new type of puzzle. True, you have not seen this until now. In importance, the emergence of this game can be compared with the emergence of sokoban or chess. In general, the essence of the game is to find such arrangement of keys, in which they all fit into the table. In fact, you play a normal puzzle, but in a very very unusual shape. At small levels, it's easy and pleasant to play, on large you load the brain well. Move the keys into the table, swipe, put in their place new, turn over "neighbors". This is the magic of pure symbols - the magic of logic!
Summation
Engage your brain with a minimalistic math puzzle game. Rearrange numbers to solve increasingly challenging levels. Explore new themes and enjoy endless gameplay.
- Minimalistic math puzzle gameplay
- Rearrange numbers to solve puzzles
- Endless levels for infinite play
- Unlockable game themes
- Brain workout challenges
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Summation is a minimalistic math game that will give your brain a workout. The objective of the game is to solve the puzzle by rearranging the numbers given to you. Sound easy? But can you get to level 100? Features: - Endless Level. You can play forever. - Unlock new game themes. - New game modes coming. Get in touch: game@lemon-jam.com Twitter:twitter.com/lemonjamstudio Facebook:facebook.com/lemonjamstudio
Screenshots
Verdict
The clearest difference is rating: Kluchi at 5.0 against Summation's 4.2. Summation's advantage is ratings volume (58 vs 1) and review sentiment (70% vs 50%). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Kluchi sells 1 one-off in-app purchase and Summation sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Kluchi holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Summation has 58 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 50% of Kluchi's written reviews are positive against 70% of Summation's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 18, 2026 and September 28, 2026 respectively.
| Parameter | Kluchi | Summation |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.2 (58 ratings) |
| Positive reviews | 50.0% of reviews | 70.0% of reviews — better |
| Number of ratings | 1 | 58 — better |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 110 MB |
| Age rating | 4+ | 4+ |
| Developer | Maxim Polous | Lemon Jam Technology Co., Ltd. |
Customer experience
Kluchi
Summation
Bugs and requests
Kluchi
Not enough reviews yet to summarise bugs or requests.
Summation
Reported bugs
12 issues- Hint button freezes game and requires reinstall to fix
- Game crashes at specific levels (e.g., level 102)
- App crashes immediately upon opening with blue dot indicator
- Full-screen ads cannot be closed and trap users
- Game gets stuck in landscape mode after full-page ad
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- Ads prevent progression in Challenge Mode
- App Store opens involuntarily multiple times in succession
- Mute setting resets every time app is opened
- Display not properly fitted for iPhone X
- Unsolvable levels in Challenge Mode after paying for ad removal
- Game Center leaderboards not accessible except after beating levels
- Next level button obscured by puzzle elements
Requested features
10 requests- Dark mode for nighttime playing
- Multiplication puzzle variant
- Increased difficulty progression beyond level 100
- More varied puzzle structures and mechanics
- Ability to purchase larger quantities of hints at once
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- Proper Game Center integration with friend additions
- Information about total number of levels available
- Night mode for bedtime gameplay
- Persistent mute setting across sessions
- Better level syncing across devices
In-app purchases
Kluchi
- 9 hints$0.99
Summation
- Buy Hints$0.99
- Remove Ads$1.99









