Welcome to Calcudoku!

Welcome to Puzzle Baron's Calcudokus! Whether you know them as Calcudoku, Mathdoku or KenKenTM, we've got thousands and thousands of unique puzzles here for you to solve. You can play for fun, or register a free account and compete against other players for the Calcudoku Hall of Fame!

How to Play

Calcudoku is just like Sudoku - you must enter numbers into a grid in such a way so that no number is repeated in any row or column. But Calcudoku puzzles have an added mathematical component! Each grid is split up into smaller sections of 2 or more squares, and each of those sections has an arithmetic equation attached to it (either addition, subtraction, multiplication or division). You must complete the grid so that the numbers is each section equal the mathematical formula assigned to it.

If you're new to Calcudoku puzzles, start off on an easy 4x4 puzzle and work your way up to the larger/harder ones. The same types of solving methods used in regular Sudoku puzzles will come in handy with these as well. Good luck!

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Why Register a Free Account?

You'll never have to register an account to play on this site, but there are several reasons you may want to play as a registered user:

If any or all of the above features sound good to you, click on the button below to register for a free account:

Register for Free »

Competition Timer
  • angelwhite angelwhite set a new record of 20 seconds on puzzle #25188 May 24, 2019, 1:10 am
  • bridget1723 bridget1723 set a new record of 124 seconds on puzzle #11845 May 23, 2019, 7:30 pm
  • bridget1723 bridget1723 set a new record of 162 seconds on puzzle #12050 May 23, 2019, 7:27 pm
  • bridget1723 bridget1723 set a new record of 97 seconds on puzzle #11728 May 23, 2019, 7:25 pm
  • mpuzzler314 mpuzzler314 set a new record of 160 seconds on puzzle #11847 May 23, 2019, 6:19 pm
  • bridget1723 bridget1723 set a new record of 183 seconds on puzzle #11716 May 23, 2019, 3:13 pm
April's Winners