# Sum Fun — Sharpen your mind, stress-free > Logic and number puzzle game with unique board shapes and strategic gameplay. (iPhone/iPad app by Greg Sharpe.) - Source: https://appshunter.io/ios/app/sum-fun/id817544892 (this page in markdown: same URL + `.md`) - Developer: [Greg Sharpe](https://appshunter.io/developer/817544895) - Category: Games, Education, Board, Puzzle - Price: Free - Rating: 4.90/5 from 33 App Store ratings · 18 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 198 MB - Languages: American English, German (Germany), Japanese, Korean, Vietnamese - Released: 2014-03-13 - Data updated: 2026-08-31 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/sum-fun/id817544892/reviews.md ## What is Sum Fun? Sum Fun – The Number Puzzle Game for Sharp Minds Place numbers, match sums, blast the board! Sum Fun is the unique number puzzle that's been loved by players worldwide since 2015. How To Play (3 simple rules): 1. Place a number into any empty slot 2. If it matches the last digit of the sum of its neighbours, they get blasted away! 3. No matches? Place a number that sets up a future sum, and keep blasting until the board is empty! Why you'll love Sum Fun: • Easy to play, fun to master – just 3 simple rules, with surprising depth and strategy • 20+ creative board shapes – play on a Hexagon, Pyramid, Star, Heart, Turtle, Rocket, Butterfly, Snowflake, and many more, with new shapes added regularly! • Seasonal Postcard Challenges – play limited-time events and collect unique downloadable artwork (by real artists!) • No time limits – play at your own pace and relax while keeping your mind sharp • Challenge friends (and yourself!) – share puzzles via QR code, text code, or pass-and-play. No internet needed! • No annoying pop-up ads – your concentration stays on the puzzle, where it belongs! We play Sum Fun too, and keep the experience friendly. • Brain-boosting gameplay – after a few games, you'll be adding up numbers faster than you can say, 'What's six plus eight?' • Multiple themes – choose from Light, Dark, and Midnight to suit your style If you enjoy Sudoku, Kakuro, or other number-based brain games, you'll love the unique twist of Sum Fun. Exercise your mind, master the numbers, and discover why players keep coming back – download free today! ## Key features - Unique number puzzle gameplay - Variety of creative board shapes - Brain-boosting mental workout - No time limits for relaxed play - Challenge friends offline - Easy to play, fun to master ## Recent user reviews (10 of 18) All indexed reviews: https://appshunter.io/ios/app/sum-fun/id817544892/reviews.md ### 5/5 — Very fun! *2026-06-26* Enjoyable game ### 5/5 — Great game *2025-09-18* I find myself pushing to improve in every game. At 74 I think I can still improve. ### 5/5 — THIS GAME HAS MASSIVE _____ *2023-05-05* this game has massive appeal and is very fun to play. great fun. warm, and very heavy, this game has made me realize how fun life can be. It has helped my math skills greatly. It has the balls to call what is truly true, truth, and sleuth the truth from the booth. ### 5/5 — Love this game! *2022-06-15* I hope to see the next one soon. I get immersed and lose track of time. Thanks a bunch, Donnalou. ### 5/5 — Maths Muse *2020-12-11* Maths solving is relaxing for some of us and this is spot on for me. ### 5/5 — Great game *2020-07-13* I find myself pushing to improve in every game. At 74 I think I can still improve. ### 5/5 — Best fun ever *2017-12-26, version 1.5.1* Keeps brain active. Excellent ### 5/5 — Fun for everyone!! *2017-12-15, version 1.5.1* A great way to get your mind into gear! Good fun for all ages. 5* ### 5/5 — Addictive! *2017-11-14, version 1.5.1* Good fun - a superb brain workout for all ages! 5* ### 5/5 — Awesome *2017-09-25, version 1.5* Love to play - relaxing fun! ## Frequently asked questions about Sum Fun ### What is Sum Fun? Sum Fun is a number puzzle game that combines logic, numbers, and strategy. It offers a unique twist on number-based puzzles with various creative board shapes and brain-boosting gameplay. ### How do you play Sum Fun? The core gameplay involves placing numbers into empty slots. If a number matches the last digit of the sum of its neighbors, they are cleared. If not, players strategically place numbers to set up future sums until the board is empty. ### Can I play Sum Fun offline? Yes, Sum Fun can be played offline. You can challenge friends by sharing games via QR code, text code, or simply passing the device for local multiplayer. ### Does Sum Fun have ads? Sum Fun contains advertisements. It features banner ads and optional rewarded ads for extra content, but no intrusive pop-up ads that interrupt gameplay. ### What devices is Sum Fun available on? Sum Fun is available on iPhone, iPad, and iPod. It is designed for iOS devices. ### What is the age rating for Sum Fun? Sum Fun has an age rating of 4+, making it suitable for a wide range of players. ### How often is Sum Fun updated? The latest version of Sum Fun is 2.6, and it was last updated on March 25, 2026. This indicates a history of updates, though the exact frequency is not specified. ### What makes Sum Fun different from Sudoku or Kakuro? Sum Fun offers a unique gameplay mechanic where placing a number can clear adjacent numbers based on a sum rule, unlike the fixed grid and elimination rules of Sudoku or Kakuro. ## Version history (last 5 releases) ### 2.10 — 2026-08-30 We're welcoming Summer with new events for Sum seasonal Fun: • Explore our Postcard Challenge and collect unique artwork from around the world, inspired by our travels! • Play brand new shapes alongside popular favourites in our limited-time Summertime Collection, including Strawberry, Tulip, Butterfly and more! Plus, we've been busy building Sum more Fun: • Choose from different sound effects collections to add sum extra spice to your game! • Replay any of your 3 most recent games – beat your own score or challenge friends! • Customise the appearance to help the board and tiles stand out more, including larger numbers for enhanced visibility • Browse and share your completed postcards in Achievements ### 2.9.4 — 2026-08-06 We're welcoming Summer with new events for Sum seasonal Fun: • Explore our Postcard Challenge and collect unique artwork from around the world, inspired by our travels! • Play brand new shapes alongside popular favourites in our limited-time Summertime Collection, including Strawberry, Tulip, Butterfly and more! Plus, we've been busy building Sum more Fun: • Choose from different sound effects collections to add sum extra spice to your game! • Replay any of your 3 most recent games – beat your own score or challenge friends! • Customise the appearance to help the board and tiles stand out more, including larger numbers for enhanced visibility • Browse and share your completed postcards in Achievements ### 2.9.3 — 2026-07-21 We're welcoming Summer with new events for Sum seasonal Fun: • Explore our Postcard Challenge and collect unique artwork from around the world, inspired by our travels! • Play brand new shapes alongside popular favourites in our limited-time Summertime Collection, including Strawberry, Tulip, Butterfly and more! Plus, we've been busy building Sum more Fun: • Choose from different sound effects collections to add sum extra spice to your game! • Replay any of your 3 most recent games – beat your own score or challenge friends! • Customise the appearance to help the board and tiles stand out more, including larger numbers for enhanced visibility • Browse and share your completed postcards in Achievements ### 2.9.2 — 2026-07-07 We're welcoming Summer with new events for Sum seasonal Fun: • Explore our Postcard Challenge and collect unique artwork from around the world, inspired by our travels! • Play brand new shapes alongside popular favourites in our limited-time Summertime Collection, including Strawberry, Tulip, Butterfly and more! Plus, we've been busy building Sum more Fun: • Choose from different sound effects collections to add sum extra spice to your game! • Replay any of your 3 most recent games – beat your own score or challenge friends! • Customise the appearance to help the board and tiles stand out more, including larger numbers for enhanced visibility • Browse and share your completed postcards in Achievements ### 2.9.1 — 2026-06-27 We're welcoming Summer with new events for Sum seasonal Fun: • Explore our Postcard Challenge and collect unique artwork from around the world, inspired by our travels! • Play brand new shapes alongside popular favourites in our limited-time Summertime Collection, including Strawberry, Tulip, Butterfly and more! Plus, we've been busy building Sum more Fun: • Choose from different sound effects collections to add sum extra spice to your game! • Replay any of your 3 most recent games – beat your own score or challenge friends! • Customise the appearance to help the board and tiles stand out more, including larger numbers for enhanced visibility • Browse and share your completed postcards in Achievements ## Apps similar to Sum Fun | App | Rating | Price | Category | | --- | --- | --- | --- | | [Total Sudoku](https://appshunter.io/ios/app/total-sudoku/id1147298304) | 4.8 (53) | Free | Games | | [Sudoku V+, soduko puzzle game](https://appshunter.io/ios/app/sudoku-v-plus-soduko-puzzle-game/id657073193) | — | Free | Games | | [Math Number Game](https://appshunter.io/ios/app/math-number-game/id6467968136) | — | Free | Games | | [Killer Sudoku Puzzle Games](https://appshunter.io/ios/app/killer-sudoku-puzzle-games/id1538715282) | 4.4 (8) | Free | Games | | [Sudoku - Sudoku Puzzle Game -](https://appshunter.io/ios/app/sudoku-sudoku-puzzle-game/id1596298388) | 4.8 (43) | Free | Games | | [Sudoku ...](https://appshunter.io/ios/app/sudoku/id1402458339) | 4.5 (146) | Free | Games | ## More apps by Greg Sharpe - [Zero?](https://appshunter.io/ios/app/zero/id1025506040) All apps by Greg Sharpe: https://appshunter.io/developer/817544895 --- *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 2026-08-31.*