Comparison

Flow Free vs The Impossible Letter Game

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

Head to head
About

Flow Free

Connect matching colored pipes to fill the board without crossing or overlapping. Enjoy hundreds of free levels or challenge yourself in timed modes. This addictive puzzle game offers a relaxing yet engaging experience for all skill levels.

Highlights
  • Connect matching colors with pipes
  • Fill the entire board
  • Over 2,500 free levels
  • Daily puzzles
  • Time Trial mode
  • Multiple board sizes
  • Level packs
Features
Read full description

Flow Free® is a simple yet addictive puzzle game. Connect matching colors with pipe to create a Flow®. Pair all colors, and cover the entire board to solve each puzzle. But watch out, pipes will break if they cross or overlap! Free play through hundreds of levels, or race against the clock in Time Trial mode. Gameplay ranges from simple and relaxed, to challenging and frenetic, and everywhere in between. How you play is up to you. So, give Flow Free a try, and experience "mind like water"! *** Flow Free features *** * Content - Over 2,500 free levels available in Free Play mode, and new Daily Puzzles every day! - 10 different board sizes - Free Classic, Bonus, Bridges, Mania, Extreme, and Jumbo level packs - Additional level packs available for purchase * Challenge - Game Center achievements as you solve levels and complete packs - Track your completion of each level in Free Play mode - Strive for accuracy in Free Play using the fewest, most efficient moves - Strive for speed in Time Trial for the most and fastest solves - 20 scored Time Trial variants to choose from by board size and duration * Look & Feel - Smooth, polished touch interaction - Colorful UI - Fun sound effects - Clean vector graphics and animations - Labels available for color impaired players Enjoy.

About

The Impossible Letter Game

Test your visual acuity and focus with this challenging puzzle game. It presents simple yet incredibly difficult levels designed to push your observational skills to the limit. Prepare for an extreme eye exercise.

Highlights
  • Extreme eye exercise
  • Challenging puzzles
  • Skill testing
  • Simple gameplay
  • Impossible levels
Features
Read full description

THE ULTIMATE EXTREME EYE EXERCISE GAME! The simplest and yet the most impossible game ever! Put your skills to the test, because this game will challenge you like never before. Good luck finding the most!

Screenshots

Flow Free4 screens
The Impossible Letter Game3 screens

Verdict

The call

The clearest difference is ratings volume: Flow Free at 408K against The Impossible Letter Game's 17K. Flow Free also leads on rating (4.8 vs 4.6) and chart position (#48 vs unranked). On price, review sentiment, update cadence and ads 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. Flow Free sells 10 one-off in-app purchases and The Impossible Letter Game sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Flow Free holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Flow Free has 408K ratings behind it against 17K, so its average is the more settled of the two. Written reviews point the same way: 82% of Flow Free's written reviews are positive against 81% of The Impossible Letter Game's.

UpkeepUpdate frequency

Flow Free ships an update every 5 months, The Impossible Letter Game every 4 months. Both last shipped on November 8, 2026.

Scorecard4 real differences · 7 level
Flow Free versus The Impossible Letter Game: the parameters behind the verdict, then further details
ParameterFlow FreeThe Impossible Letter Game
PriceFreeFree
Rating4.8 (408K ratings) — better4.6 (17K ratings)
Positive reviews82.5% of reviews — better81.4% of reviews
Number of ratings408K — better17K
Update frequencyEvery 5 monthsEvery 4 months — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#48 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.1
Further details — not scored
Size77 MB75 MB
Age rating4+4+
DeveloperBig Duck Games LLCGammaLateral LLC

Customer experience

Flow Free

All ratings407,540 ratings
Positive95.2%
Neutral2.7%
Negative2.1%
Written reviews1,787 reviews
Positive82.5%
Neutral4.8%
Negative12.7%

The Impossible Letter Game

All ratings17,369 ratings
Positive88.5%
Neutral6.4%
Negative5.1%
Written reviews226 reviews
Positive81.4%
Neutral6.2%
Negative12.4%

User reviews

Flow Free

From 408K App Store ratings

What we love

  • 👍 Relaxing and fun
  • 🧠 Challenges the brain
  • ⏱️ Good for passing time
  • 🔓 No WiFi required
  • 💻 Works well on different devices

Room to improve

  • 🔍 Ads can be intrusive
  • 💰 Hints/levels can be expensive
  • 🤯 Levels can get too difficult
  • 🔁 Daily streak issues

The Impossible Letter Game

From 17K App Store ratings

What we love

  • 👍 Fun and challenging game
  • 🧠 Helps improve focus and attention to detail
  • 🎨 Visually appealing design
  • 🕹️ Addictive gameplay

Room to improve

  • 🔍 Some levels are too difficult
  • 🕰️ Timer continues running during ads
  • 💰 Too many ads
  • 🤕 Can strain the eyes

Bugs and requests

Flow Free

Reported bugs

2 issues
  • Game freezing or crashing
  • Ads getting stuck and preventing progress

Requested features

4 requests
  • More challenging levels for older players
  • Ability to earn hints through gameplay
  • Option to change background color for themes
  • Sync progress across devices

The Impossible Letter Game

Reported bugs

2 issues
  • Inconsistent level difficulty
  • Crashing and freezing issues

Requested features

3 requests
  • Option to skip difficult levels
  • Pause timer during level transitions
  • More game modes and level variety

In-app purchases

10 purchases

Flow Free

One-time10
  • 5 Hints$0.99
  • Green Pack$1.99
  • Blue Pack$1.99
Show 7 more
  • Purple Pack$1.99
  • 10x10 Mania$1.99
  • Starter Bundle$1.99
  • Unlock All Themes$1.99
  • 20 Hints$2.99
  • Unlock All Packs and Remove Ads$4.99
  • 100 Hints$9.99
4 purchases

The Impossible Letter Game

One-time4
  • Get 30 Hints$0.99
  • Get 70 Hints$1.99
  • Get 120 Hints$2.99
Show 1 more
  • Remove Ads$9.99

Questions

Is Flow Free free?
Flow Free is free to download, with in-app purchases available.
Is The Impossible Letter Game free?
The Impossible Letter Game is free to download, with in-app purchases available.
Which has better reviews, Flow Free or The Impossible Letter Game?
Flow Free is rated higher. Flow Free averages 4.8 out of 5 from 408K ratings, while The Impossible Letter Game averages 4.6 from 17K ratings.
Do Flow Free or The Impossible Letter Game have ads?
Both Flow Free and The Impossible Letter Game show ads.
Which is updated more often, Flow Free or The Impossible Letter Game?
Flow Free ships an update every 5 months, and The Impossible Letter Game every 4 months. Most recently, Flow Free was updated on November 8, 2026 and The Impossible Letter Game on November 8, 2026.

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