Opdoku = Calcudoku + Mathdoku

Opdoku = Calcudoku + Mathdoku

Challenging, Simple and Funny

10 ratings
9 reviews
Free

Details

  • Released
  • Updated
  • September 26, 2016
  • January 24, 2025

Features

Opdoku = Calcudoku + Mathdoku screenshot #1 for iPhone
Opdoku = Calcudoku + Mathdoku screenshot #2 for iPhone
Opdoku = Calcudoku + Mathdoku screenshot #3 for iPhone
Opdoku = Calcudoku + Mathdoku screenshot #4 for iPhone
Opdoku = Calcudoku + Mathdoku screenshot #5 for iPhone
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About

This logic puzzle game combines Sudoku-style number placement with mathematical operations. Solve grids where each digit appears once per row/column and within groups that must equal a specific mathematical result. Offers unique variations and an infinite supply of puzzles.

Sudoku-like row and column constraints
Mathematical group operations
Optional min/max operations
Unknown mathematical operations
Unknown group results
Unique puzzle solutions
Infinite puzzle generation
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What's New in Opdoku = Calcudoku + Mathdoku

6.0

January 24, 2025

- 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.

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User reviews

Challenging, fun, no ads

Love it, but I can't figure out how to turn the possible numbers on.

Response from developer

Thank you for your feeback! and please press „Show“ on the bottom left to see the possible numbers. Or contact me by using „Feedback“ on the main screen and I will help you.

Challenging

I love the variety of modes in this game. The UI is clean, easy, and fast to use. I like to play some of the hardest modes. It forced me to think outside the box.

Old request: I would like to have a way to mark possibilities on each tile as opposed to only one number. EDITED: They were nice enough to add this feature, yay!

Ongoing request: I also want to be able to momentarily highlight all numbers of a specific value on the board (both big and small numbers) to make it easier to see what to do next. This will be especially useful for harder puzzles.
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Response from developer

Update: With the new version 6.0, you can now not only mark the possible combinations per group, but also those per digit.

Missing Features

I love the variety of modes in this game. I would like to have a way to mark possibilities on each tile as opposed to only one number. I also want to be able to highlight all numbers on the board of a specific value to make it easier to see what to do next. This will be especially useful for harder puzzles. I am willing to pay a one time price for these additional features.
Edited: There has not been any updates since the developer's response.
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Response from developer

Update: With the new version 6.0, you can now not only mark the possible combinations per group, but also those per digit.

Best Kenken app I’ve found.

There are no advertisements, they’re not hounding you for money, and the implementation of the puzzles is great. It’s a breath of fresh air.

Response from developer

Thank you very much!

Confusing

The settings are confusing

Response from developer

With the latest version, I have tried to optimize the start screen and also made help information directly accessible from there.

Developer apps

FAQ

What is Opdoku?

Opdoku is a free logic puzzle game that combines Sudoku rules with mathematical operations. Players must place digits in a grid so that each digit appears only once in each row and column, and within specified groups that achieve a given mathematical result.

Does Opdoku have ads or in-app purchases?

No, Opdoku is completely free of charge, with no advertisements or additional purchases. Users have praised its lack of monetization, allowing for uninterrupted gameplay.

What makes Opdoku different from Mathdoku?

Opdoku offers three improvements over standard Mathdoku: it can include minimum and maximum operations for more variety, puzzles where the mathematical operation is unknown, and puzzles where not all group results are known, increasing the challenge.

How many puzzles are available in Opdoku?

Opdoku puzzles are generated automatically, providing a virtually infinite number of unique puzzles. The difficulty ranges from easy 3x3 grids to challenging 6x6 grids with minimal clues.

What devices can I play Opdoku on?

Opdoku is available for iPhone, iPad, and iPod. It is designed to run on Apple's mobile operating system.

What is the age rating for Opdoku?

Opdoku has an age rating of 4+, making it suitable for young children and players of all ages. The puzzles are designed to be engaging and mentally stimulating.

How often is Opdoku updated?

The latest version of Opdoku is 6.0, and it was last updated on January 24, 2025. This indicates a recent update, suggesting ongoing support and potential improvements.

What do users like about Opdoku?

Users love Opdoku for its simple, easy-to-use interface and its completely free nature with no ads or requests for money. The puzzles are frequently described as great and engaging.