# + & - : A Zen game > Zen-inspired number puzzle game with strategic addition and subtraction mechanics. (iPhone/iPad app by Marco Locatelli.) - Source: https://appshunter.io/ios/app/plus-and-a-zen-game/id880084583 (this page in markdown: same URL + `.md`) - Developer: [Marco Locatelli](https://appshunter.io/developer/380883258) - Category: Games, Education, Board, Puzzle - Price: Free with in-app purchases - Rating: 5.00/5 from 2 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 4 MB - Languages: American English, Italian - Released: 2014-06-29 - Data updated: 2026-06-03 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/plus-and-a-zen-game/id880084583/reviews.md ## What is + &? This is a special game, a bit Zen a bit strategic, take your time but not too much. The rules are two: 1) equal numbers on background of equal color are added 2) different numbers on background of different color are subtracted Tap two numbers, the result will take the place of the second. Make the highest score you can. - you can save the current game and start a new one, so that you can play up to 9 games at the same time. - when you exceed 500 points, you'll be able to swap the numbers of two quartets of different color, dragging one over the other. - customize the colors of the board with 351 different combinations - you can also change the user interface color, light or dark ## Key features - Strategic number addition and subtraction - Save and manage multiple games - Unlockable number swapping ability - Customizable board and UI colors - Zen-like gameplay experience ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Change The Number | $0.99 | one-time | ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/plus-and-a-zen-game/id880084583/reviews.md ### 5/5 — Great App *2014-10-04* The object of this game is to get a high score. Your working on a 16 square grid that contains two colors. Sounds simple right. You achieve this goal by adding and subtracting numbers. However, there are rules that govern how this math can be done. To add, both numbers must be the same and come from the same color. To subtract, the numbers must be different and come from different colors. You'll find that you' ll often make a mistake and when you do, another number will be added to the grid. Once the grid fills up, it's game over. Going for the highest score possible isn't easy. Part of the problem is that there is no Save Game Feature. So you must achieve your best score all in one sitting. If they add this feature, this will be one of the best apps you can get, hands down. ## Frequently asked questions about + & ### How do you play + & - : A Zen game? You tap two numbers. If they have equal numbers on a background of equal color, they are added. If they have different numbers on a background of different color, they are subtracted. The result replaces the second number tapped. The goal is to achieve the highest score. ### Can I play multiple games of + & - : A Zen game at once? Yes, you can save the current game and start a new one, allowing you to play up to 9 games simultaneously. ### What happens when I reach 500 points in + & - : A Zen game? Once you exceed 500 points, you unlock the ability to swap the numbers of two quartets of different colors by dragging one over the other. ### Does + & - : A Zen game have ads? No, this game does not contain advertisements, offering an uninterrupted experience. ### How many color combinations are available in + & - : A Zen game? You can customize the colors of the board with 351 different combinations, and also change the user interface color to light or dark. ### What devices is + & - : A Zen game compatible with? + & - : A Zen game is available for iPhone, iPad, and iPod devices. ### What is the age rating for + & - : A Zen game? The game has an age rating of 4+, making it suitable for younger players. ### How often is + & - : A Zen game updated? The latest version is 2.3.2, and it was last updated on January 7, 2026. This suggests a consistent update schedule. ## Version history (last 5 releases) ### 2.3.2 — 2026-01-07 • removed the button to access Game Center which has been disabled ### 2.3.1 — 2025-10-21 - updated to iOS26 - Game Center disabled ### 2.3 — 2022-05-09 Updated the App to the latest devices. ### 2.2 — 2019-03-09 • adapted the graphics to the iPhone X... • changed the APP icon ### 2.1 — 2017-03-23 - Added the option to show the Status Bar. ## Apps similar to + & | App | Rating | Price | Category | | --- | --- | --- | --- | | [five equal](https://appshunter.io/ios/app/five-equal/id946460526) | — | Free | Games | | [Flower Board™](https://appshunter.io/ios/app/flower-board/id434811164) | 4.4 (95) | Free | Games | | [Number Chain by SZY](https://appshunter.io/ios/app/number-chain-by-szy/id490969339) | 3.0 (1) | Free | Games | | [Twenty four - Merge Number](https://appshunter.io/ios/app/twenty-four-merge-number/id1143869839) | — | Free | Games | | [814](https://appshunter.io/ios/app/814/id1049036485) | — | Free | Games | | [ALTILES](https://appshunter.io/ios/app/altiles/id1247728244) | — | Free | Games | ## More apps by Marco Locatelli - [Wordare](https://appshunter.io/ios/app/wordare/id683208496) - [Jump'em All](https://appshunter.io/ios/app/jumpem-all/id939199769) - [2numbers - 2numeri](https://appshunter.io/ios/app/2numbers-2numeri/id1092951537) - [My Days - I miei Giorni](https://appshunter.io/ios/app/my-days-i-miei-giorni/id1185302644) - [Capiamoci](https://appshunter.io/ios/app/capiamoci/id1441874579) All apps by Marco Locatelli: https://appshunter.io/developer/380883258 ## Related topics [marco locatelli](https://appshunter.io/ios/topics/marco-locatelli) · [locatelli](https://appshunter.io/ios/topics/locatelli) --- *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 2026-06-03.*