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About Calcudoku · Math Logic Puzzles

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

About Calcudoku math puzzles:

Every Calcudoku has a single solution that can be reached logically. Like Sudoku, 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 free math 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 Sudoku variant, was originally invented in 2004 by Japanese math teacher Tetsuya Miyamoto.

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

Jody Monroe
This game is both fun and challenging. It makes you think! I
Charles Dubick
Pretty good. Puzzles and UI are good, ads usually don't bother much. I do wish I could just pay to remove ads, or even better, that this was on google play pass.
Luiz A D R Marques