# GREG - A Mathematical Puzzle Game To Train Your Brain Skills

> Mathematical puzzle game to enhance mental flexibility and math skills. (iPhone/iPad app by Marco Torretta.)

- Source: https://appshunter.io/ios/app/greg-a-mathematical-puzzle-game-to-train-your-brain-skills/id895726517 (this page in markdown: same URL + `.md`)
- Developer: [Marco Torretta](https://appshunter.io/developer/560750786)
- Category: Games, Education, Puzzle, Strategy
- Price: $0.99
- Rating: 4.50/5 from 98 App Store ratings · 102 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 6 MB
- Languages: English, Japanese, Chinese
- Released: 2014-09-03
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/greg-a-mathematical-puzzle-game-to-train-your-brain-skills/id895726517/reviews.md

## What is GREG?

###
• Apple Best New Games
• #1 Puzzle Game App
• “A puzzle game that will test your speed and math skills, a gameplay mechanic both invigorating and challenging.” - AppAdvice
• “An excellent, fun way to kickstart the grey matter.” - Gamezebo
• “A solid game with nice graphics, good gameplay and a practical learning.” - AppGefahren.de

WHAT OUR USERS SAY
• Polished interface. Mentally beneficial and challenging gameplay. What else do you want?
• Extremely addicting and fun game. Who knew that adding numbers could be so exciting!
• Very fun game and it really helps me with my math skills. One of my favorite downloads.
• If you love numbers, this is for you. If not, you will learn to love numbers!
• In no overstated terms, I'm obsessed with the game. I hate phone games. But GREG is inescapable.
###


Do you think additions are easy?
Challenge yourself and play GREG, a simple mathematical game that will enhance your mental flexibility!
The main purpose of the game is to combine the numbers in the grid to match the given one. The more you go ahead, the more difficult the game will become.


GAMEPLAY
Simple and addictive gameplay, suitable for both quick and long-lasting matches.
The better you play the more points and gold you earn!

ITEMS AND SPELLS
Need some help? Use special items and spells to help you in the game!
You can easily get more items by using the gold you earn within the game.

MULTIPLAYER
Challenge your friends like never before in an innovative multiplayer mode!
Show your friends who is smarter by defeating them in a game where cleverness, reflexes and strategy combine. 
Multiplayer is available only on iPhone 4S or newer.

GAME CENTER
Climb the leaderboards and prove you are the best player!
And if you feel good enough try to earn all the 35 engaging and unique achievements.

UNIVERSAL
Enjoy GREG on your iPhone and your iPad too, so you can test your mathematical skills in every moment.

ICLOUD
All your progress and game stats are synced between all your devices, so you don’t have to worry about having different data on your iPhone and your iPad. 


SPECIAL NOTES
• Follow @playGREG on Twitter for the latest!
• Have a problem? Want to give us a feedback? Remember: we can't respond to App Store reviews, so email us at greg@marcotorretta.com
• Developed in collaboration with Stefano Figurelli.

Have fun playing GREG!

## Key features

- Number combination puzzles
- Mental flexibility training
- Items and spells for assistance
- Multiplayer mode
- Game Center leaderboards and achievements
- Universal app for iPhone and iPad
- iCloud progress syncing

## What do users think of GREG?

Overall sentiment: positive

**Pros**

- 🧠 Excellent brain exercise and mental math training
- 😊 Highly addictive and engaging gameplay
- 🎮 Multiple difficulty levels for all skill ranges
- 🎨 Clean, simple design with good color palette
- ⚡ Fast-paced and challenging mechanics
- 🏆 Helps improve mental arithmetic and reflexes
- 🔧 Stable, bug-free performance
- 👨‍👩‍👧‍👦 Suitable for all ages from kids to adults
- 🎯 Easy to learn but difficult to master
- 💰 Good value with reward system (gold)

**Cons**

- 🔄 Repetitive gameplay becomes boring over time
- 📱 Needs optimization for new screen shapes
- ⏱️ Timer and color changes cause stress
- 🎨 Color coding system is confusing
- 😰 Game becomes frustratingly difficult at higher levels
- 🔊 Lacks variety in game mechanics
- ⚙️ Responsive tap detection issues reported
- 📊 Limited gameplay innovation after extended play

**Commonly reported bugs**

- Numbers switching around unexpectedly
- Taps not registering on numbers
- Game ending abruptly
- Non-responsive interface requiring multiple taps
- Game acting up on same level after extended play

**Most requested features**

- Multiplication, subtraction, and division modes
- Slower speed levels for elementary school students
- Gameplay variety and twists to prevent boredom
- Level save/checkpoint function
- Different layout variations
- Beginner and novice difficulty tiers
- Classroom/teaching tool version
- Continuous countdown system instead of discrete levels

## Recent user reviews (10 of 102)

All indexed reviews: https://appshunter.io/ios/app/greg-a-mathematical-puzzle-game-to-train-your-brain-skills/id895726517/reviews.md

### 5/5 — Good game

*2022-10-31*

Very good to exercise your brain

### 5/5 — Wonderful game I have enjoyed for many years

*2022-09-21*

Helps me to stay sharp and I love the colour palette. 

Needs to be updated for new screen shapes.

### 5/5 — Fun, not rocket science

*2022-07-23, version 3.1.5*

This can be enjoyable

### 5/5 — Good Game

*2021-05-20*

It's a good exercise for the brain

### 5/5 — Awesome game!

*2021-02-08, version 3.1.5*

Great for learning! I highly recommend this game!

### 3/5 — Love and challenging

*2019-07-15, version 3.1.5*

I love this app. It is always fun to have some challenge in the game

### 5/5 — Awesome

*2019-06-27, version 3.1.5*

Plus I get gold to write a review!

### 5/5 — Great game

*2019-02-09, version 3.1.5*

Helps keep the ol’ noggin sharp!

### 5/5 — Great app

*2018-10-30, version 3.1.5*

Great!

### 4/5 — Great app for mental skills

*2018-04-09, version 3.1.5*

Offers a great space to develop Math skills. The time limit is useful to increase metacognition skills.

## Frequently asked questions about GREG

### What is GREG?

GREG is a mathematical puzzle game designed to enhance your mental flexibility and math skills. The core gameplay involves combining numbers in a grid to match a given target number, with increasing difficulty as you progress.

### What are the key features of GREG?

Key features include addictive number combination gameplay, special items and spells to aid players, an innovative multiplayer mode to challenge friends, Game Center integration for leaderboards and achievements, and iCloud syncing for progress across devices.

### Is GREG free to play?

Yes, GREG is a free game. While the description mentions earning gold within the game to get more items, there is no indication of any upfront cost or subscription fees.

### What devices is GREG compatible with?

GREG is a universal app, meaning you can enjoy it on both your iPhone and iPad. Multiplayer mode is specifically available on iPhone 4S or newer.

### How does GREG help with math skills?

The game's core mechanic of combining numbers to reach a target score directly engages and sharpens your arithmetic abilities. It makes practicing addition and other number-based calculations engaging and fun, helping to improve speed and mental agility.

## Version history (last 5 releases)

### 3.1.5 — 2016-03-08

This app has been updated by Apple to display the Apple Watch app icon.

• Added a "News" section;

If you like GREG, please consider leaving an App Store review. It really helps small developers like ourselves.
Have a problem? Want to give us a feedback? Remember: we can't respond to App Store reviews, so email us at greg@marcotorretta.com.

### 3.1.4 — 2016-02-22

• Bugfix;

If you like GREG, please consider leaving an App Store review. It really helps small developers like ourselves.
Have a problem? Want to give us a feedback? Remember: we can't respond to App Store reviews, so email us at greg@marcotorretta.com.

### 3.1.3 — 2015-10-23

• Fixed a wrong link to the App Store;

If you like GREG, please consider leaving an App Store review. It really helps small developers like ourselves.
Have a problem? Want to give us a feedback? Remember: we can't respond to App Store reviews, so email us at greg@marcotorretta.com.

### 3.1.2 — 2015-08-22

• Fixed some minor bugs in the game.

If you like GREG, please consider leaving an App Store review. It really helps small developers like ourselves.
Have a problem? Want to give us a feedback? Remember: we can't respond to App Store reviews, so email us at greg@marcotorretta.com.

### 3.1.1 — 2015-08-11

• Fixed some minor bugs in the game.

If you like GREG, please consider leaving an App Store review. It really helps small developers like ourselves.
Have a problem? Want to give us a feedback? Remember: we can't respond to App Store reviews, so email us at greg@marcotorretta.com.

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## More apps by Marco Torretta

- [Amount - Unit Converter](https://appshunter.io/ios/app/amount-unit-converter/id560750783)
- [Globo - World Clock and Weather](https://appshunter.io/ios/app/globo-world-clock-and-weather/id818329067)
- [Lettercraft - A Word Puzzle Game To Train Your Brain Skills](https://appshunter.io/ios/app/lettercraft-a-word-puzzle-game-to-train-your-brain-skills/id960841415)
- [Amount Plus - Unit Converter](https://appshunter.io/ios/app/amount-plus-unit-converter/id1031021466)

All apps by Marco Torretta: https://appshunter.io/developer/560750786

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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 2026-06-10.*