Opdoku = Calcudoku + Mathdoku
Challenging, Simple and Funny
Free · Designed for iPad
M.: »Absolutely love this app - simple easy to use interface and free.«
D.: »There's no advertising, they don't ask you for money, and the puzzles are great.«
Opdoku is completely free of charge, with no adverts or additional purchases. Sounds good? Try it out today! The rules are simple:
○ As in Sudoku, each digit can only appear once in each row and column.
○ Each digit is part of a group, each of which has a mathematical operation and a result. All digits in the group have to achieve the specified result using this mathematical operation.
Your task is to enter the digits in the grid so that both of these rules are met. Sounds easy? Give it a try!
Opdoku is similar to Mathdoku, but with three improvements:
○ If you wish, the puzzle can also have two additional mathematical operations – minimum and maximum. This makes the game more varied and diverse.
○ You can solve puzzles in which only the result of a group is known, but not the mathematical operation. How is 4 reached? Is it 1 + 3, 1 x 4 or 4 / 1? Anything is possible! Hint – 1 is always present.
○ You can even solve puzzles in which not all results of the groups are known. Only geniuses need apply!
All Opdoku puzzles have a unique solution. As they are generated automatically a virtually infinite number of puzzles are available. These range from easy ones on a 3x3 grid to virtually impossible ones with barely any clues on a 6x6 grid.
- New start screen with improved help and high score
- New functionality to mark possible solutions per digit
- Puzzles are saved when the application is closed
- Visual and ergonomic improvements: click behavior, screen and font size, etc.
The developer, Christian Rusche, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Christian Rusche
- Size
- 485.4 KB
- Category
- Puzzle
- Compatibility
Requires iOS 15.6 or later.
- iPhone
Requires iOS 15.6 or later. - iPad
Requires iPadOS 15.6 or later. - iPod touch
Requires iOS 15.6 or later. - Mac
Requires macOS 12.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2025 Christian Rusche