NineGaps vs Rudoku
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
NineGaps
This is a challenging puzzle game where you place numbers 1-9 into gaps, matching operations. It offers a unique twist on number puzzles with multiple difficulty levels and endless replayability.
- Unique puzzle gameplay
- Cute graphics
- 5 difficulty levels
- Unlimited puzzles
- Leaderboards and achievements
- GameCenter integration
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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
Rudoku
This is a challenging number and logic puzzle game with multiple modes and difficulty levels. Track your progress with detailed stats and earn achievements. Enjoy endless playability with unique puzzles and accessibility features like dark mode.
- Multiple game modes
- Adjustable difficulty levels
- Variable board sizes
- Detailed gameplay stats
- Multiple achievements
- Dark and light color modes
- No in-app purchases
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Rudoku is an expert level puzzle challenge for fans of numbers and logic games. Multiple game modes, difficulty levels, and board sizes will keep your brain stimulated as you decipher the solutions to each puzzle. Maintaining high gameplay stats and earning multiple achievements will make Rudoku your go-to brain teaser. Take your time and see how long it takes you in Relaxed Mode. Speed and accuracy come into play in Race Mode when your goal is to solve the puzzle before time runs out. Endless Mode makes each game board increasingly difficult to solve. KEY FEATURES • Endless Playability - Puzzles will never repeat while multiple game modes, difficulty levels, and board sizes keep the challenge fresh and your brain sharp. • Game Play Stats - In game stats will let you know the duration of each game, how many moves you made, your win percentage, and more. • Dark and Light Colour Modes - This great accessibility feature makes the screen easier on your eyes in the dark. • Multiple Achievements - Earn awards and Game Centre points a number of different ways including level achievements and stats challenges. • No In-App Purchases - Pay once and play. No need to waste time on ads or pesky in-app purchasing gimmicks.
Screenshots
Verdict
The clearest difference is rating: Rudoku at 4.7 against NineGaps's 4.0. Rudoku also leads on monetization model (free vs paid) and update cadence (every 3 weeks vs every 26 months). NineGaps's advantage is iOS requirement (10.3 vs 18.0). On price, review sentiment, ratings volume and ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Rudoku holds the better App Store score, 4.7 against 4.0. Both are backed by a comparable volume of ratings — 10 and 19 respectively. Written reviews complicate that: 88% of NineGaps's written reviews are positive against 85% of Rudoku's, so the app with the better star average is not the one people write more warmly about.
NineGaps ships an update every 26 months, Rudoku every 3 weeks. Both last shipped on October 29, 2026.
| Parameter | NineGaps | Rudoku |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (10 ratings) | 4.7 (19 ratings) — better |
| Positive reviews | 88.1% of reviews — better | 84.6% of reviews |
| Number of ratings | 10 | 19 — better |
| Update frequency | Every 26 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.3 — better | 18.0 |
| Further details — not scored | ||
| Size | 72 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Quadion Technologies LLC | Cerebral Gardens |
Customer experience
NineGaps
Rudoku
Bugs and requests
NineGaps
Reported bugs
7 issues- 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
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- Unsolvable puzzle generation reported
- Incorrect answer validation (marking correct answers as wrong)
Requested features
14 requests- 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
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- 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
Rudoku
Not enough reviews yet to summarise bugs or requests.
In-app purchases
NineGaps
No in-app purchases
Rudoku
No in-app purchases









