Calcudoku · Math Sudoku Puzzle

Contains ads
4.5
2.42K reviews
100K+
Downloads
Content rating
PEGI 3
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About this game

Enjoy Calcudoku, a fun number puzzle game that tests your math and logic! If you like Killer Sudoku puzzles, you will love Calcudoku!

About Calcudoku number puzzles:

Every Calcudoku has a single solution that can be reached logically. Like Sudoku, Killer Sudoku and KenKen®, fill in the grid such that no two digits repeat in any column or row. Use the shapes in the grid as your guide. Each shape contains a number equaling the product of the shapes' digits. For example a shape with three cells containing the number 6 may have cell values 1, 2 and 3, as 1 × 2 × 3 = 6. Challenge yourself further with larger grids for experts, up to 9x9 size!

Calcudoku offers thousands of fun number puzzles with features to help you solve each puzzle. Enjoy an unlimited number of hints and checks in case you get stuck. Use the calculator tool to help with multiplication and division against large numbers. And rest assured that all puzzle games are automatically saved and restored letting you stop and restart games with ease.

Track your best and average solve times over history with our stats tracker.

Calcudoku, a popular Killer Sudoku variant, was originally invented in 2004 by Japanese math teacher Tetsuya Miyamoto. Also known as KenKen® and Mathdoku, Calcudoku brings to you over 15,000 unique puzzle grids!

You can play Calcudoku by Razzle Puzzles on your phone and tablet. Enjoy Calcudoku online or in offline mode!

For support please contact us at [email protected] or visit RazzlePuzzles.com
Updated on
Aug 14, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Device or other IDs
This app may collect these data types
App activity, App info and performance, and Device or other IDs
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.5
2.12K reviews
John Douglas
July 28, 2023
This is a good game, just a shame about the ads. Yes it's either watch ads or pay - I get it, but when the advert is over why can't we go back to the game without having to go to ad part 2 and ad part 3? That's when it goes over the line from acceptable necessity to overbearing annoyance. I'm sticking with it for a while, but can't see me keeping it for the long term.
14 people found this review helpful
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A Google user
October 22, 2019
Great game, terrible interface. Easier acces to undo, reset, hint and delete a must. Also, can't select multiple cases when in "notes" mode which slows down the game. At times, the "notes" will not update when an number is inputted somewhere else on the line/column. Finally, visual queue to indicate in "notes" mode is barely visible (pen on an angle instead of flat). Something more obvious would be appreciated. Otherwise, great potential!
6 people found this review helpful
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Sam Persons
May 10, 2024
Been playing this to use my brain on days I otherwise don't have to, and I really like how the app lets you personalize your experience. You can use the built in calculator, and check to make sure your answers are correct in the options as you're playing, or you can opt for a bigger challenge by not checking until it's all filled out. I like it a lot and would recommend it to anyone who likes more laid-back math puzzles.
5 people found this review helpful
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Razzle Puzzles
May 10, 2024
Thank you for the review!