Comparison

The Impossible Letter Game vs PolyBlocks Vision VR

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

Head to head
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!

About

PolyBlocks Vision VR

Features
Read full description

PolyBlocks Vision VR is a virtual reality puzzle game designed to support players with lazy eye (amblyopia & strabismus). Drawing inspiration from visual therapy research, it offers an entertainment-based experience that takes a fun-first approach to improving binocular vision through engaging, eye-coordinated gameplay. Core Premise Control falling blocks, place them strategically, and clear lines in a unique dual-screen system where: - One eye sees falling blocks - The other eye sees placed blocks - Your brain combines both images into one complete picture to successfully play the game and exercise your binocular vision Core Gameplay - Rotate and place blocks to complete lines - Clear lines to continue progressing - Each eye contributes part of the solution - A fresh twist on classic puzzle gameplay What You'll Need - Smartphone VR Headset (e.g., Google Cardboard) - Bluetooth Controller (PlayStation, Xbox, 8BitDo, and more) Key Features Screen Calibration - Adjust screen placement to match your eyes and align based on your degree of strabismus or eye misalignment (e.g., exotropia, esotropia, hypertropia, hypotropia, etc.) - Supports a range of visual conditions Configurable Controls - Fully re-mappable controls across gameplay and menus - Compatible with Bluetooth-enabled controllers - Customize your playstyle for comfort and control Accessibility Settings - Toggle which eye sees falling blocks - Enable or disable animations (background and blocks) - Adjust brightness (alpha) for each eye, helping balance visual input for players with amblyopia (lazy eye) - Personalize your experience for clarity and comfort Building Back Vision, One Block at a Time While inspired by medical studies on visual therapy, PolyBlocks Vision VR is not an FDA approved treatment. Health Drop Games LLC (c) 2026 Patent Pending

Screenshots

The Impossible Letter Game3 screens
PolyBlocks Vision VR4 screens

Verdict

The call

The clearest difference is in-app purchases: PolyBlocks Vision VR at none against The Impossible Letter Game's 4. PolyBlocks Vision VR also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.1). On price 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. The Impossible Letter Game sells 4 one-off in-app purchases. PolyBlocks Vision VR asks for nothing beyond the download.

Scorecard3 real differences · 7 level
The Impossible Letter Game versus PolyBlocks Vision VR: the parameters behind the verdict, then further details
ParameterThe Impossible Letter GamePolyBlocks Vision VR
PriceFreeFree
Rating4.6 (17K ratings) — better—
Positive reviews81.4% of reviews—
Number of ratings17K — better—
Update frequencyEvery 4 months—
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.113.0 — better
Further details — not scored
Size75 MB189 MB
Age rating4+4+
DeveloperGammaLateral LLCHealth Drop Games LLC

Bugs and requests

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

PolyBlocks Vision VR

Not enough reviews yet to summarise bugs or requests.

In-app purchases

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
None

PolyBlocks Vision VR

No in-app purchases

Questions

Is The Impossible Letter Game free?
The Impossible Letter Game is free to download, with in-app purchases available.
Is PolyBlocks Vision VR free?
PolyBlocks Vision VR is free to download, with no in-app purchases.
Do The Impossible Letter Game or PolyBlocks Vision VR have ads?
The Impossible Letter Game shows ads; PolyBlocks Vision VR does not.

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