Comparison

Kluchi vs Calcudoku

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Key placement puzzle
  • Unique connector mechanics
  • Special 'neighbors' keys
  • Hint system
  • Brain training benefits
  • New puzzle type
Features
Read full description

«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!

About

Calcudoku

This logic puzzle game offers a unique approach to learning how to solve number grids. Instead of simply revealing answers, it provides intelligent, step-by-step guidance on logical strategies and note-taking to help you master the puzzles.

Highlights
  • Intelligent step-by-step explanations
  • Optional auto notes for cages
  • Intuitive note-taking interface
  • Variety of arithmetic operations
  • Grids for all skill levels
  • Offline-first architecture
  • Dark mode support
Features
Read full description

Tired of puzzle games that just give you the answer when you get stuck? Welcome to a smarter way to play Calcudoku. Whether you are a seasoned veteran or a logic puzzle beginner, our app doesn’t just show you where numbers go—it teaches you how to find them. --- THE SMART DIFFERENTIATOR --- When you hit a wall, our built-in helper analyzes your exact grid state and explains the logical next step. Instead of ruining the puzzle by solving the cell for you, the engine guides you through advanced grid strategies. You’ll learn how to cross-reference cages, update your notes, and look for cell candidate reductions so you can solve the grid completely on your own. --- KEY GAME FEATURES --- • INTELLIGENT EXPLANATIONS: Step-by-step guidance focused on note-taking, elimination strategies, and candidate pruning. • OPTIONAL AUTO NOTES: Start new games with notes in cells based on cage arithmetic. • SMOOTH NOTES: Rapidly input and edit candidate notes with an intuitive, fluid UI built for mobile screens. • COMPLETE ARITHMETIC VARIETY: Choose grids featuring addition, subtraction, multiplication, and division loops. • GRIDS FOR EVERY SKILL LEVEL: Play everything from quick 4x4 warmups to grueling, massive 9x9 math matrices. • POLISHED INTERFACE: Full native dark mode support, crisp typography, and an offline-first architecture so you can play anywhere without Wi-Fi. Master the grid, elevate your deduction skills, and train your brain with a game that actually makes you a better solver.

Screenshots

Kluchi4 screens
Calcudoku4 screens

Verdict

The call

The clearest difference is in-app purchases: Calcudoku at none against Kluchi's 1. Kluchi's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 2 months). On price, rating, ratings volume and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Kluchi sells 1 one-off in-app purchase. Calcudoku asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Kluchi against 5.0 for Calcudoku. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

Kluchi ships an update every 3 weeks, Calcudoku every 2 months. The most recent releases landed on September 18, 2026 and October 3, 2026 respectively.

Scorecard4 real differences · 6 level
Kluchi versus Calcudoku: the parameters behind the verdict, then further details
ParameterKluchiCalcudoku
PriceFreeFree
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews50.0% of reviews—
Number of ratings12 — better
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size5 MB104 MB
Age rating4+4+
DeveloperMaxim PolousLogicSmith

Customer experience

Kluchi

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Calcudoku

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Kluchi

One-time1
  • 9 hints$0.99
None

Calcudoku

No in-app purchases

Questions

Is Kluchi free?
Kluchi is free to download, with in-app purchases available.
Is Calcudoku free?
Calcudoku is free to download, with no in-app purchases.
Which has better reviews, Kluchi or Calcudoku?
Kluchi and Calcudoku are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do Kluchi or Calcudoku have ads?
Calcudoku shows ads; Kluchi does not.
Which is updated more often, Kluchi or Calcudoku?
Kluchi ships an update every 3 weeks, and Calcudoku every 2 months. Most recently, Kluchi was updated on September 18, 2026 and Calcudoku on October 3, 2026.

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