Summation vs The challenge is impossible
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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
The challenge is impossible
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A simple and interesting game, when the game begins, the player can see the current activities of the target, and some small monsters, players can control the activities of the target to launch bullets, must be within the specified time to capture all the small monsters. The direction of the arrow will determine the direction of the bullet. When you hit a small monster, the target will move to the position of the little monster that is currently shot. After hitting all the little monsters, you can take the current challenge, and after each challenge you can get some rewards, add points and some small star rewards. The ultimate goal of the player is to pass all the challenges. How to Play: When the game starts, click on the screen to launch the bullet in the direction indicated by the arrow. Until we hit all the little Monsters. The player aims to complete all challenges. You can play this game at any place you like,. Bus, subway, or wherever there is time to play this game, if you think the game is good, you can give us a score, or add a message. You can also share this game with your friends. Game features: The coordination of the brain and the hand! Puzzle Leisure! Easy to get started with! Simple and fun! Cool picture! It's FREE! Are you ready? Can you pass all the challenges?
Screenshots
Verdict
The clearest difference is in-app purchases: The challenge is impossible at none against Summation's 2. Summation's advantage is update cadence (every 3 weeks vs every 78 months) and iOS requirement (9.0 vs 12.0). On price, ads 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
Both are free to download. Summation sells 2 one-off in-app purchases. The challenge is impossible asks for nothing beyond the download.
Summation ships an update every 3 weeks, The challenge is impossible every 78 months. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.
| Parameter | Summation | The challenge is impossible |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (58 ratings) — better | — |
| Positive reviews | 70.0% of reviews | — |
| Number of ratings | 58 — better | — |
| Update frequency | Every 3 weeks — better | Every 78 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 110 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Lemon Jam Technology Co., Ltd. | 志荣 胡 |
Bugs and 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
The challenge is impossible
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Summation
- Buy Hints$0.99
- Remove Ads$1.99
The challenge is impossible
No in-app purchases
Questions
Is Summation free?
Is The challenge is impossible free?
Do Summation or The challenge is impossible have ads?
Which is updated more often, Summation or The challenge is impossible?
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