# Killer Aid — Killer Sudoku combinations > Killer Sudoku helper app for calculating and filtering cage combinations. (iPhone/iPad app by Trevor Butler.) - Source: https://appshunter.io/ios/app/killer-aid/id921229517 (this page in markdown: same URL + `.md`) - Developer: [Trevor Butler](https://appshunter.io/developer/921229516) - Category: Games, Utilities, Puzzle - Price: Free - Rating: 4.86/5 from 42 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 12.4 · 1 MB - Languages: English - Released: 2014-11-13 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/killer-aid/id921229517/reviews.md ## What is Killer Aid? If you've struggled to complete tricky, tough, or deadly Killer Sudoku puzzles then this App could be for you. It provides a suite of tools to aid finding the minimum number of combinations that add up to each cage’s sum. The results are clearly displayed with any duplicate numbers highlighted in red. The target number of cells and their sum is entered using the edit tool. This presents a pick list of cells and sums values to simplify their selection and prevent invalid entries. It is also possible to select the display of combinations with duplicate values. Filter tools help reduce the possible combinations. Three variants of filter are provided namely: ・Exclude ・Include AND ・Include OR The exclude filter removes any combinations that contain the specified numbers. The "include AND" filter reduces the combinations down to those that include all the specified numbers. The "include OR" filter facilitates including combinations that contain one or more of a set of numbers. These three filter types can be combined together. Cage combinations can also be manually deleted. A calculator tool, optimised for solving Killer puzzles, is provided. This helps with some of the solving strategies (e.g. determining the sums of “innies” and “outies” - remainders inside and outside the a 3 x 3 square, row or column). The calculator includes formula text to keep track of entries. Lastly a support menu provides access to help, Killer Sudoku solving strategies and references sources of Killer Sudoku puzzles. ## Key features - Cage combination calculation - Duplicate number highlighting - Filter tools (Exclude, Include AND, Include OR) - Optimized calculator for Killer Sudoku - Help and strategy resources ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/killer-aid/id921229517/reviews.md ### 5/5 — Just Perfect *2024-09-03* Didn’t over complicate it. It’s just perfect. Thanks for putting in the time to create. ### 5/5 — Brilliant! *2024-01-14, version 3.0.2* Fantastic tool and free too! ### 5/5 — Not frustrated now *2021-01-28* This app is magic. Now I can successfully do even the hard Sum Sudoku ‘s. ### 5/5 — Excellent App *2017-06-17, version 2.1.1* Much better than the one I wrote for Windows. ### 5/5 — Useful *2016-10-25, version 2.0* A well designed and useful app for Killer Sudoku solvers. Easy to use with a logical and well laid out interface. ### 5/5 — Awesome app *2015-06-21* Has a ton of filtering options. Easy to use. ### 5/5 — Very helpful! *2014-12-15, version 1.0* Really useful app to help solve killer sudoku. Best one I have found! ## Frequently asked questions about Killer Aid ### What is Killer Aid? Killer Aid is a free mobile application designed to help users solve difficult Killer Sudoku puzzles. It offers tools for calculating and filtering number combinations within cages. ### How does Killer Aid help with Killer Sudoku? Killer Aid provides tools to find the minimum number of combinations that add up to a cage's sum. It also highlights duplicate numbers and offers filtering options to narrow down possibilities. ### Does Killer Aid have ads? No, Killer Aid is ad-free, allowing for an uninterrupted puzzle-solving experience. ### What devices support Killer Aid? Killer Aid is available on iPhone, iPad, and iPod devices. ### What is the age rating for Killer Aid? Killer Aid has an age rating of 4+, making it suitable for a wide range of players. ### How often is Killer Aid updated? The latest version of Killer Aid is 3.0.2, and it was last updated on September 27, 2022. ### Can Killer Aid be used offline? The description does not specify offline capabilities, but its primary function as a puzzle helper suggests it may not require a constant internet connection for core features. ### What are the filter tools in Killer Aid? Killer Aid offers 'Exclude' to remove combinations with specified numbers, 'Include AND' to keep combinations with all specified numbers, and 'Include OR' to keep combinations with at least one of the specified numbers. These can be combined. ## Version history (last 5 releases) ### 3.0.2 — 2022-09-27 Fixed the problem of the extra tabletop padding introduced in iOS 15. Addressed the deprecated code warnings. ### 3.0.1 — 2020-06-07 Minor fix to the request review handling. ### 3.0 — 2020-04-24 Fully recoded from Objective C into Swift. Now supports dark mode. Custom menus have been replaced with pop-ups. Privacy Policy added. ### 2.1.2 — 2017-12-19 Revised the title and subtitle to be compliant with iOS 11. The calculator tool now clears the total in the display rather than reflecting the current sum. Clearing the Include OR filter resets to the first colour. Extended to handle the new iPhone X. The Sudoku strategies page has been extended to include an example of using combinations with duplicates. Multi-tasking is now properly supported. The third party iRate framework has been removed. Reviews are now handled either by Apple's request review (iOS 10.3 and above) or by directing calling the App Store. ### 2.1.1 — 2017-05-23 When the calculator sum does not fit within the current cell count range limits, then the cell count is automatically adjusted to the nearest value that can accommodate the sum. ## Apps similar to Killer Aid | App | Rating | Price | Category | | --- | --- | --- | --- | | [Total Sudoku](https://appshunter.io/ios/app/total-sudoku/id1147298304) | 4.8 (53) | Free | Games | | [Killer Sudoku - Puzzle Games](https://appshunter.io/ios/app/killer-sudoku-puzzle-games/id1549645019) | 4.8 (5,827) | Free | Games | | [Kakuro++ Cross Sums Puzzles](https://appshunter.io/ios/app/kakuro-plus-plus-cross-sums-puzzles/id1445001139) | 4.8 (602) | Free | Games | | [Futoshiki Puzzle Game](https://appshunter.io/ios/app/futoshiki-puzzle-game/id846765771) | 4.6 (455) | Free | Games | | [Killer Sudoku Master-SumSudoku](https://appshunter.io/ios/app/killer-sudoku-master-sumsudoku/id6464051208) | 4.5 (10) | Free | Games | | [Sudoku Puzzle - Brain Games](https://appshunter.io/ios/app/sudoku-puzzle-brain-games/id1492978794) | 4.9 (83,867) | Free | Games | --- *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 2026-06-10.*