XXI vs Muse
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
XXI
This puzzle game challenges you to arrange numbered gems on a board so that each row and column sums to 21. Progress through 200 levels of increasing difficulty, utilizing a special gem that can be 1 or 11. Compete with others via leaderboards and share your achievements.
- 200 unique puzzles
- Special gem mechanics
- Game Center achievements
- Leaderboard competition
- Beautiful graphics and sound
- Universal app support
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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/
Muse
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Muse - Slide Puzzle "Muse - Slide Puzzle" is an addictive puzzle game that can be enjoyed with simple controls. Slide square objects to aim for the goal, and utilize various gimmicks to find the shortest route. Features: Simple yet deep gameplay: Despite its intuitive controls, the game offers challenges across various levels. Use your wits to devise strategies and find the shortest route to the goal. Diverse stages and gimmicks: With over 100 stages currently available, players will face challenges of varying difficulty levels and encounter different gimmicks. New stages and gimmicks will be added through updates. Customization with Diamonds: Collect diamonds, the in-game currency, to customize the game's appearance. Create your own unique play screen and enhance the enjoyment of the game. Compete with players on social media: Share the number of moves it took to clear a stage on social media. Compete with friends and other players to see who can clear stages with the fewest moves. Upcoming Features: Regular updates: New stages and gimmicks will be added through regular updates, providing players with fresh challenges. Embark on a journey into the world of "Muse - Slide Puzzle" and experience the ultimate puzzle adventure!
Screenshots
Verdict
The clearest difference is update cadence: Muse at every 4 months against XXI's every 17 months. On price, ads, in-app purchases and device support 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.
XXI ships an update every 17 months, Muse every 4 months. The most recent releases landed on August 13, 2026 and September 19, 2026 respectively.
| Parameter | XXI | Muse |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (15 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 17 months | Every 4 months — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 27 MB | 105 MB |
| Age rating | 4+ | 4+ |
| Developer | TMSOFT | Daiki Maeda |
In-app purchases
XXI
No in-app purchases
Muse
No in-app purchases









