# NineGaps

> Number puzzle game placing 1-9 into gaps to match operations. (iPhone/iPad app by Quadion Technologies LLC.)

- Source: https://appshunter.io/ios/app/ninegaps/id317223443 (this page in markdown: same URL + `.md`)
- Developer: [Quadion Technologies LLC](https://appshunter.io/developer/317223446)
- Category: Games, Puzzle
- Price: Free
- Rating: 4.10/5 from 11 App Store ratings · 109 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.3 · 72 MB
- Languages: American English, European Spanish
- Released: 2009-05-28
- Data updated: 2026-06-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ninegaps/id317223443/reviews.md

## What is NineGaps?

Featured by Apple as "Best Math Puzzle Game" and "New and Noteworthy"

NineGaps is a highly addictive and tricky puzzle game.

The goal of the game is really simple. You have to use your wits to place numbers from 1 to 9 in the missing gaps, while matching the operations presented in the puzzle. It's just like sudoku, but different!

FEATURES:
 • simple and unique puzzle-based gameplay
 • cute graphics
 • 5 difficulty levels 
 • unlimited brain burning puzzles
 • global and friend leaderboards
 • achievements
 • GameCenter integration
 • highly addictive and fun!

Fans of Sudoku, KenKen and TwentyFour will feel right at home!

Test your puzzle cracking skills with NineGaps today!


PRESS REVIEWS:
..."sudoku-style puzzle game featuring a clever twist", Macworld
..."polished, fantastic looking iPhone app that anyone can enjoy", MacYourself
..."there is no reason this great puzzle app shouldn't be downloaded today", AppModo
..."with random boards the replayability is pretty much endless", In Touch Reviews
..."simple game with a simple design and does it simply perfect", GameZebo
..."make way for another highly addictive game coming out for your iPhone", Mobilewhack
..."great for all ages whether you want a math refresher or a fun way to teach kids math skills", The AppPodcast
..."this is a simple looking brain burning challenger", iPhone Footprint
..."sudoku meets calculator, has baby, calls it NineGaps", Mobile Game Faqs
..."highly addictive puzzle game", iPhone Toolbox
..."fun and challenging", AppChatter
..."easy to pick up and hard to put down", iPhone App Reviews


CONTACT US
- Visit us: ninegapsapp.com
- Follow us: twitter.com/quadionTouch
- Become a fan: facebook.com/pages/Quadion-Technologies/65161686424

Check out our other exciting games: Rune Trails and Wordweaver

## Key features

- Unique puzzle gameplay
- Cute graphics
- 5 difficulty levels
- Unlimited puzzles
- Leaderboards and achievements
- GameCenter integration

## What do users think of NineGaps?

Overall sentiment: positive

**Pros**

- 🧠 Excellent brain training and mental math improvement
- 🎮 Simple yet challenging gameplay mechanics
- 🎨 Clean, polished, and attractive visual design
- ⏱️ Quick games perfect for short waiting periods
- 👨‍👩‍👧‍👦 Suitable for multiple age groups and skill levels
- 🎯 Multiple difficulty levels (easy, medium, hard)
- 💰 Great value for the price
- 🧩 Unique puzzle concept combining logic and math
- 🚀 Smooth and bug-free performance
- 😄 Satisfying audio feedback on correct answers

**Cons**

- 🔊 Loud sound effects that cannot be controlled properly
- 💾 No game saving feature when closing app
- 🧮 Does not follow proper order of operations (PEMDAS)
- 🔴 Occasional crashes or app not opening
- 🎮 Limited replay value after extended play
- 🔧 Sound settings don't persist between sessions
- 👁️ Difficulty distinguishing selected pieces during gameplay
- 🚫 Incorrect answer detection (false negatives reported)
- 📊 No user account or persistent high score tracking

**Commonly reported bugs**

- Sound effects stop working intermittently
- App crashes or fails to open on launch
- Sound volume settings not saving between sessions
- OpenFeint achievements not awarding properly
- Mathematical calculation errors in some puzzles
- Unsolvable puzzle generation reported
- Incorrect answer validation (marking correct answers as wrong)

**Most requested features**

- Solution/reveal button to show answers when stuck
- Hint system for difficult puzzles
- Game auto-save functionality
- Persistent sound settings across sessions
- Global leaderboards for competition
- Multiplayer mode or WiFi challenges
- Larger grids (4x4, 5x5) for increased difficulty
- Puzzle numbering system for tracking progress
- Ability to view completed games
- Confirmation dialog before resetting high scores
- Brackets/parentheses support in equations
- Higher difficulty levels for advanced players
- More game modes and variations
- Improved color contrast for colorblind users

## Recent user reviews (10 of 109)

All indexed reviews: https://appshunter.io/ios/app/ninegaps/id317223443/reviews.md

### 5/5 — Unmatched simple brilliance

*2016-12-26, version 1.5*

If you're pretty good at math, this is a game that's beautifully challenging and beautiful to look at as well.  Perfection.

### 1/5 — Very disappointing.

*2013-08-08, version 1.4*

This app is very disappointing! I bought it in the hope that it would help me to become quicker at mental arithmetic, but this app is wrong! It tells me I'm wrong when I know I am right!! 
I don't know whether this app is faulty or a scam, but it's definitely not worth the 69p! Doesn't even deserved any stars but I have to put one cause then it won't let me write a review!!

### 4/5 — Good time pass

*2013-06-03, version 1.4*

Small game but a nice time pass...not as tough as a sudoku.

### 5/5 — Nine gaps

*2012-10-21, version 1.4*

Challenging fun. One of my favorites.

### 5/5 — Awesome game!

*2012-05-30, version 1.4*

Love the new hint button!

### 5/5 — Excellent Game

*2011-12-30, version 1.2*

Great game

### 5/5 — Super fun

*2011-11-12, version 1.2*

Great for all ages.  My kids can beat me!!  Games are quick so fills up waiting times nicely.

### 4/5 — Good quick fun!

*2011-07-08, version 1.2*

Great game to pick up and play that doesn't take long and is fun!  Keeps your mind working and sharp!

### 5/5 — Fun

*2011-07-08, version 1.2*

Like it

### 4/5 — Good!!!!

*2011-06-22, version 1.2*

Fun math game. Good for kids!

## Frequently asked questions about NineGaps

### What is NineGaps?

NineGaps is a highly addictive and tricky puzzle game. The goal is to use your wits to place numbers from 1 to 9 in the missing gaps, while matching the operations presented in the puzzle. It's described as a unique twist on Sudoku.

### What are the key features of NineGaps?

Key features include simple and unique puzzle-based gameplay, cute graphics, 5 difficulty levels, unlimited puzzles, global and friend leaderboards, achievements, and GameCenter integration.

### How much does NineGaps cost?

Based on the provided information, the app is a paid application. There are no mentions of in-app purchases or advertisements, suggesting a one-time purchase model.

### What kind of puzzles does NineGaps offer?

The game features number puzzles where players place digits 1 through 9 into designated gaps. These placements must satisfy specific mathematical operations presented within the puzzle grid, similar to Sudoku but with a different mechanic.

### Who would enjoy playing NineGaps?

Fans of Sudoku, KenKen, and TwentyFour will likely enjoy NineGaps. It's also great for all ages, whether you want a math refresher or a fun way to teach kids math skills, as it tests puzzle-cracking skills.

## Version history (last 5 releases)

### 1.6 — 2018-11-21

We've refreshed our app to be back in the store and work again with newer devices and iOS.

We hope you enjoy NineGaps!

### 1.5 — 2014-05-27

• Updated art for 4 inch displays (sorry for the huge delay).
 • Rebuilt for 64 bits architectures.
 • Minor bug fixes.

If you enjoy NineGaps, please consider rating it in the AppStore, as it helps other users discover our app. Thank you!

### 1.4 — 2012-03-01

• New and improved retina graphics.
• Game Center support.
• Hint button available as an in-app purchase.

### 1.2 — 2010-01-22

• Integrated OpenFeint
• Global Highscores
• Achievements
• Challenges
• Social Notifications

### 1.1 — 2009-09-13

• Order of operations is supported in all puzzles.
• Puzzles are now a little more difficult to solve.
• Game status is auto-saved, allowing a puzzle to be continued at any time.
• Game settings are persisted.
• Two new levels for beginner users were added.
• Puzzles can now be seen after they are finished.
• Application size was reduced to 1.6Mb.

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## More apps by Quadion Technologies LLC

- [Trails Game](https://appshunter.io/ios/app/trails-game/id356440542)
- [Bicisendas](https://appshunter.io/ios/app/bicisendas/id1427739408)

All apps by Quadion Technologies LLC: https://appshunter.io/developer/317223446

## Related topics

[OpenFeint](https://appshunter.io/ios/topics/openfeint) · [OpenFeint](https://appshunter.io/ios/topics/openfeint)

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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 2026-06-08.*