# Letter Number — Advanced concentration game

> Advanced concentration game (iPhone/iPad app by Ivan Gastilovic.)

- Source: https://appshunter.io/ios/app/letter-number/id6748435873 (this page in markdown: same URL + `.md`)
- Developer: [Ivan Gastilovic](https://appshunter.io/developer/1599069138)
- Category: Education, Games, Casual, Puzzle
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 28 MB
- Languages: English
- Released: 2025-07-14
- Data updated: 2026-07-04
- User reviews in markdown: https://appshunter.io/ios/app/letter-number/id6748435873/reviews.md

## What is Letter Number?

Unlock Your Focus with Letter Number!

Letter Number is a fast, challenging game designed for players with sharp minds and top-tier concentration. It may seem simple at first—but mastering it takes serious mental agility!

How to Play:
A number and a letter appear together in a yellow box.
Your task? Decide based on the current prompt:
- Is the number even or odd?
- Is the letter a vowel or a consonant?

But here’s the twist:
The focus keeps switching between numbers and letters—forcing your brain to adapt in real time.
And as you give more correct answers:
- Time gets shorter
- The pace gets faster
- The challenge gets tougher!

Why You’ll Love It:
- Builds extreme focus and mental flexibility
- Trains both logic and reaction speed
- A true test of concentration under pressure
- Fun, addictive, and endlessly replayable

Stick with it, and you’ll uncover hidden powers of focus you never knew you had.

Thanks for playing and supporting Letter Number — now let’s see how far your mind can go!

Subscriptions Terms of Use(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/


## Version history (last 5 releases)

### 1.4 — 2026-07-01

Add history, shop and rules pages
Fix translation bugs

### 1.3 — 2025-09-09

Correct bug with consonant letters. Add Russian letters when Russian language is selected.

### 1.2 — 2025-09-05

More games button

### 1.1 — 2025-08-05

Updated ads

### 1.0 — 2025-07-14

No release notes.

## More apps by Ivan Gastilovic

- [Unique Brains](https://appshunter.io/ios/app/unique-brains/id1599069136)
- [i-School](https://appshunter.io/ios/app/i-school/id1599975363)
- [Linyo](https://appshunter.io/ios/app/linyo/id1623364491)
- [Mental Counting](https://appshunter.io/ios/app/mental-counting/id6748052489)
- [Rising Colors](https://appshunter.io/ios/app/rising-colors/id6748052558)
- [Simple Countings](https://appshunter.io/ios/app/simple-countings/id6748052642)

All apps by Ivan Gastilovic: https://appshunter.io/developer/1599069138

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-04.*