# iAddThree — Easy Cognitive Training

> Cognitive training math game where you add three to numbers, wrapping around zero. (iPhone/iPad app by Nikolai Nobadi.)

- Source: https://appshunter.io/ios/app/iaddthree/id1389962750 (this page in markdown: same URL + `.md`)
- Developer: [Nikolai Nobadi](https://appshunter.io/developer/1330360753)
- Category: Games, Health & Fitness, Casual, Puzzle
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 30 MB
- Languages: American English
- Released: 2018-06-26
- Data updated: 2026-06-01
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/iaddthree/id1389962750/reviews.md

## What is iAddThree?

Train your brain and improve your focus with the simple yet challenging math game, iAddThree. 

Adapted from an exercise that was used to measure cognitive focus in the popular book Thinking Fast and Slow by Daniel Kahneman, iAddThree engages your mind by bending the rules of basic math to give your brain the mental exercise it deserves.

THE RULES-------------

It's simple. Just add 3 to each of the four numbers that are presented. The challenge? No double digits. Instead, you must wrap around to 0.

Normally, 8+3=11, but in iAddThree, 8+3=1. Think of it as a line of numbers that are constantly repeating.

8 -> 9 -> 0 -> 1 -> 2 -> 3.

The struggle provided by this simple math game will have you boasting about your high score to all your friends. 

So, how well do you think you can iAddThree?

## Key features

- Cognitive training
- Focus improvement
- Unique math rules
- Brain exercise
- High score challenges

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/iaddthree/id1389962750/reviews.md

### 5/5 — A workout for your brain.

*2018-06-09*

Was looking for an app that would keep my brain thinking. This math one sure does. The adding is pretty easy except in round 28 and up when it speeds up.  The subtraction is a little more challenging but it’s the challenge section that keeps u on your toes. But you got to get through the add and subtract section to get to the challenge section. A little workout for my brain.

## Frequently asked questions about iAddThree

### What is iAddThree?

iAddThree is a cognitive training game designed to improve focus and mental agility. It uses a unique math rule where you add three to each number, with results wrapping around to zero.

### How do you play iAddThree?

The core mechanic is to add 3 to each of the four numbers presented. If adding 3 results in a double-digit number, it wraps around to 0, like 8+3=1. The goal is to achieve high scores.

### Is iAddThree suitable for all ages?

Yes, iAddThree has an age rating of 4+, making it suitable for a wide range of players looking for a mental challenge.

### What devices does iAddThree support?

iAddThree is available on iPhone and iPad, offering a consistent experience across Apple mobile devices.

### How often is iAddThree updated?

The app was last updated on January 29, 2024, indicating active development and potential for future improvements and content.

### Does iAddThree have ads?

Yes, iAddThree contains advertisements, which is common for free mobile applications.

### What is the user rating for iAddThree?

iAddThree has received a perfect 5.0-star rating from one review, suggesting a very positive initial user reception.

### Can I play iAddThree offline?

The provided description does not specify offline play capabilities. However, many puzzle games of this nature can be played without an internet connection.

## Version history (last 5 releases)

### 3.5.0 — 2024-01-29

*Minor UI enhancements and bug fixes*

### 3.0.0 — 2023-07-21

*New Hybrid Mode*

Why choose between adding and subtracting when you can do both? With hybrid mode, each level will require either adding or subtracting to get the right answer.

### 2.8.0 — 2023-06-27

Now you can earn bonus points for maintain a streak of perfect scores for each level! You'll have to get every number correct for 3 straight levels in order to receive the bonus points.

### 2.6.0 — 2023-06-05

*Minor Bug Fixes*

### 2.5.1 — 2023-04-19

*Minor UI updates*

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## More apps by Nikolai Nobadi

- [iCleanMe](https://appshunter.io/ios/app/icleanme/id1350310256)
- [iGetGroceries](https://appshunter.io/ios/app/igetgroceries/id1578530983)
- [iOweYou: Debt Tracker](https://appshunter.io/ios/app/ioweyou-debt-tracker/id6450847298)
- [Hoursaurus](https://appshunter.io/ios/app/hoursaurus/id6743008502)

All apps by Nikolai Nobadi: https://appshunter.io/developer/1330360753

## Related topics

[iaddthree](https://appshunter.io/ios/topics/iaddthree)

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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 2026-06-01.*