# iKnockOut > Educational math game for practicing addition and subtraction with dice. (iPhone/iPad app by John Millhouse.) - Source: https://appshunter.io/ios/app/iknockout/id541406859 (this page in markdown: same URL + `.md`) - Developer: [John Millhouse](https://appshunter.io/developer/415183789) - Category: Education, Games, Board - Price: $0.99 - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 26.0 · 14 MB - Languages: American English - Released: 2012-08-15 - Data updated: 2026-08-13 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/iknockout/id541406859/reviews.md ## What is iKnockOut? iKnockOut is a fun way for 1 to 4 students to learn addition and subtraction of numbers between 1 and 18. Play against the computer in one player mode. The game consists of a board with 18 numbers 1 through 18 with two spots per number to hold a colored marble. Marbles are placed on a number based on the roll of three dice. Placing a marble on a number with another color marble will knock the other marble out. A number with two marbles of the same color are captured and cannot be played on any more. Capture five numbers before your opponent to win the game. There are three play modes: Standard, Modified and Free Play. STANDARD PLAY: The values of the dice must be added or subtracted to equal an open number on the board. All dice must be used to place one or two marbles on the board. You cannot place three marbles and you cannot place your two marbles on the same number in a single turn. For example, if you rolled a 3, 6 and 5, on an empty board there are 10 possible moves. Some possible combinations for one marble are 3+6+5=14 or 6-3+5=8. Some possible combinations for two marbles are (6-5=1 and 3) or (5 and 3+6=9). I'll let the user figure out the other possible moves or tap HINTS to see other moves. MODIFIED PLAY: Place marbles based on the total sum of the dice. One to ten marbles may be placed. You are not limited to two marbles like standard play. For example, if you rolled a 3, 6 and 5, the sum is 14. You then add or subtract open numbers that total up to 14. Therefore you can place one marble on 14 or two marble on 11 and 3 (3+11=14) or two marbles on 15 and 1 (15-1=14) or three marbles on 1,2 and 11 (1+2+11=14) or four marbles of 2,3,4,5 (2+3+4+5=14). The HINT button will show combinations up to 3 marbles. FREE PLAY: In FREE Play there are no rules and no hints. Make up your own rules. There is no limit to the variation you can come up with for this game. ## Key features - Addition and subtraction practice - Numbers 1-18 - Dice-based gameplay - Marble capturing mechanics - Three play modes: Standard, Modified, Free Play - Single-player vs. computer ## Frequently asked questions about iKnockOut ### What is iKnockOut? iKnockOut is a paid educational game designed to help children learn and practice addition and subtraction of numbers between 1 and 18. It uses dice rolls and a marble-based board game mechanic to make learning engaging. ### What age is iKnockOut suitable for? iKnockOut is suitable for children aged 4 and up, as indicated by its age rating. The game's mechanics and learning objectives are designed for early elementary school students. ### How does iKnockOut teach math? The game teaches math by requiring players to use the values from dice rolls to perform addition or subtraction to match numbers on the game board. Players strategically place marbles to capture numbers, reinforcing arithmetic concepts. ### What are the different play modes in iKnockOut? iKnockOut offers three distinct play modes: Standard, Modified, and Free Play. Standard and Modified modes have specific rules for using dice values and placing marbles, while Free Play allows for custom rule creation. ### Can iKnockOut be played by multiple people? Yes, iKnockOut can be played by 1 to 4 students. It supports single-player mode against the computer and can be used for group learning activities. ### What devices does iKnockOut support? iKnockOut is available on iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating system. ### How often is iKnockOut updated? The latest version of iKnockOut is 26.0, and it was last updated on October 7, 2025. This indicates a history of ongoing development and support from the developer. ### Does iKnockOut have ads? No, iKnockOut does not contain advertisements. As a paid application, it provides an uninterrupted learning experience without any ad interruptions. ## Version history (last 5 releases) ### 26.0 — 2025-10-07 Update for iOS26 ### 17.0 — 2023-12-19 Update for iOS 17.0. Backward compatible to iOS 15.5. ### 16.0 — 2023-05-15 Update for iOS 16 ### 13.0 — 2020-04-14 Update for iOS 13 and dark mode ### 12.0 — 2018-11-09 Update for new iOS. Bug fix ## More apps by John Millhouse - [Roman Calculator](https://appshunter.io/ios/app/roman-calculator/id415183786) - [iAggravation](https://appshunter.io/ios/app/iaggravation/id504344368) - [iAggravation Lite](https://appshunter.io/ios/app/iaggravation-lite/id1161240063) - [iMuggins](https://appshunter.io/ios/app/imuggins/id1239184791) - [iTip-Well](https://appshunter.io/ios/app/itip-well/id1296407818) All apps by John Millhouse: https://appshunter.io/developer/415183789 --- *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.*