# XXI: 21 Puzzle Game — Fun, Exciting, Challenging! > A number puzzle game where rows and columns must sum to 21. (iPhone/iPad app by TMSOFT.) - Source: https://appshunter.io/ios/app/xxi-21-puzzle-game/id1082830282 (this page in markdown: same URL + `.md`) - Developer: [TMSOFT](https://appshunter.io/developer/288669797) - Category: Games, Entertainment, Board, Puzzle - Price: Free - Rating: 4.90/5 from 15 App Store ratings · 15 written reviews indexed - Age rating: 4+ - Requires: iOS 11.0 · 27 MB - Languages: American English - Released: 2016-03-23 - Data updated: 2026-08-13 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/xxi-21-puzzle-game/id1082830282/reviews.md ## What is XXI? XXI puzzles require a sum of 21 in every row and column. Move the gems around on the board until a solution is found. All gems have a unique numerical value, but watch out for the special gem that can be either a 1 or 11. Puzzles get harder as you progress your way through all 200 levels. Can you become a XXI champion? FEATURES - 200 Unique & Challenging Puzzles - Game Center Achievements (V, X, L, C, CC) - Game Center Leaderboard for Highest Level - Beautiful Music, Sounds, and Retina Graphics - Universal App looks Great on iPhone and iPad - Share Solution Photos with Friends Thanks for playing XXI by TMSOFT and good luck! Website: https://www.tmsoft.com/xxi/ ## Key features - 200 unique puzzles - Special gem mechanics - Game Center achievements - Leaderboard competition - Beautiful graphics and sound - Universal app support ## Recent user reviews (10 of 15) All indexed reviews: https://appshunter.io/ios/app/xxi-21-puzzle-game/id1082830282/reviews.md ### 5/5 — XXI *2016-05-07* Really good puzzle game. I can not stop playing. Download it now!!!! ### 5/5 — Nice challenge *2016-04-09* Fun and challenging without being frustrating. A little easy to start, but by the 100th level, it starts to get interesting. ### 5/5 — Another win *2016-04-07* TM Soft does it again with an addicting and challenging game that keeps me entertained in waiting rooms, passenger seats of cars, and at work. ### 5/5 — Lost hours *2016-04-04* Really addictive platform that made me lose time and stay up waaaaaay too late. Save some for Dad now ### 5/5 — Great game *2016-04-02* Great game. TMOS - I get it! ### 5/5 — Great game! *2016-04-02* Reminds me of a bar top game I used to play in my younger "bar cruising" days. Oscar said it was good, and I have to agree. ### 5/5 — Superb *2016-04-01* Tons of fun! Way to go ToMo! ### 5/5 — Makes you think *2016-03-29* I like this sort of game. Gets me thinking outside the box. ### 5/5 — Not a knockoff of another game, but a new and fun game *2016-03-28* TMSOFT has a suite of really fun games. XXI continues in this trend with a fun and original game. I enjoy relaxing and figuring out the pattern ### 5/5 — Awesome Game! *2016-03-28* Love it. Very cool. ## Frequently asked questions about XXI ### What is the main objective of XXI? The main objective of XXI is to arrange the numbered gems on the board so that every row and every column adds up to exactly 21. ### How many levels are there in XXI? XXI features 200 unique and challenging levels that increase in difficulty as you progress through the game. ### Does XXI have ads? Yes, XXI contains advertisements. As a free game, it is supported by ads to allow players to enjoy it without charge. ### Can I play XXI on my iPad? Yes, XXI is a universal app and looks great on both iPhone and iPad, offering a seamless experience across Apple devices. ### What is the age rating for XXI? XXI has an age rating of 4+, making it suitable for young players and families. ### Does XXI offer offline play? The provided information does not specify if XXI supports offline play. However, features like Game Center achievements and leaderboards suggest an internet connection may be beneficial. ### How often is XXI updated? XXI was last updated on July 14, 2023, indicating that the developer actively maintains and improves the game. ### What makes the special gem in XXI unique? The special gem in XXI is unique because it can represent either the number 1 or the number 11, adding a strategic element to solving the puzzles. ## Version history (last 5 releases) ### 1.6.2 — 2023-07-14 - Support library updates - Support for latest iOS versions ### 1.6.1 — 2022-02-24 - Support library updates - Support for latest iOS versions ### 1.5 — 2021-10-09 - Various updates to support latest iOS and library updates. ### 1.4 — 2018-07-31 This app has been updated by Apple to display the Apple Watch app icon. iPhone X support and additional improvements under the hood. ### 1.2 — 2016-04-02 Launch day bug fixes. ## Apps similar to XXI | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sequetur](https://appshunter.io/ios/app/sequetur/id884501258) | 5.0 (1) | $2.99 | Games | | [Mini Measure](https://appshunter.io/ios/app/mini-measure/id6754825094) | 5.0 (1) | Free | Games | | [Sosu der](https://appshunter.io/ios/app/sosu-der/id6483364985) | — | Free | Games | | [Muse-SlidePuzzle](https://appshunter.io/ios/app/muse-slidepuzzle/id6480391214) | — | Free | Games | | [Wood Food Block: Puzzle Game](https://appshunter.io/ios/app/wood-food-block-puzzle-game/id6753868974) | — | Free | Games | | [ThePrimes](https://appshunter.io/ios/app/theprimes/id418752919) | — | Free | Games | ## More apps by TMSOFT - [Fart Cushion](https://appshunter.io/ios/app/fart-cushion/id289738462) - [White Noise](https://appshunter.io/ios/app/white-noise/id289894882) - [White Noise Lite](https://appshunter.io/ios/app/white-noise-lite/id292987597) - [Card Counter](https://appshunter.io/ios/app/card-counter/id293742180) - [Audiogasm: Music Visualizer - Real time animation of audio and music for iPhone, iPod touch, and iPad](https://appshunter.io/ios/app/audiogasm-music-visualizer-real-time-animation-of-audio-and-music-for-iphone-ipod-touch-and-ipad/id301351375) - [Springer](https://appshunter.io/ios/app/springer/id309210359) All apps by TMSOFT: https://appshunter.io/developer/288669797 --- *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 2026-08-13.*