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!

Start a New Puzzle »



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
  • WKDJAN WKDJAN set a new record of 223 seconds on puzzle #12984
    June 15, 2024, 2:41 pm
  • G. Ubbedikoe G. Ubbedikoe set a new record of 96 seconds on puzzle #12550
    June 15, 2024, 1:23 pm
  • G. Ubbedikoe G. Ubbedikoe set a new record of 86 seconds on puzzle #12306
    June 15, 2024, 12:27 pm
  • G. Ubbedikoe G. Ubbedikoe set a new record of 73 seconds on puzzle #12697
    June 15, 2024, 2:22 am
  • G. Ubbedikoe G. Ubbedikoe set a new record of 119 seconds on puzzle #12427
    June 15, 2024, 2:12 am
  • flooower flooower set a new record of 261 seconds on puzzle #1920
    June 14, 2024, 2:31 pm
May's Winners