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Calcudoku


Are you a fan of Calcudoku? Did you know that KenKen was the inspiration for Calcudoku, and the recognized king of math and logic puzzles? Discover our KenKen puzzles, challenging and rewarding puzzle games that combine the logic of sudoku with added value of mathematical operations. We offer a diverse range of puzzles, perfect for those who enjoy both sudoku websites and math-based challenges. Our KenKen puzzles are designed to test your numerical and logical reasoning skills, providing an engaging and brain-stimulating experience for Calcudoku enthusiasts of all ages. Plus, you can design your own puzzles, with grid sizes ranging from 3x3 to 9x9, with 10 degrees of difficulty and your choice of math operations. You can also play our Daily Challenge for each grid size, testing your talents against other puzzlers.

KENKEN for your Mobile

Fun, addicting, yet educational. The KenKen iOS and Android apps are perfect for the whole family!

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Love Calcudoku? Try KenKen!


Calcudoku, also known as Mathdoku, is more than just a game; it's a mental exercise that enhances problem-solving abilities and promotes cognitive development. Our KenKen puzzle was the inspiration for Calcudoku and presents a unique challenge, requiring players to fill the grid with numbers while adhering to the mathematical clues provided. Whether you're a seasoned player or new to the puzzle world, our website offers an array of KenKen puzzles ranging from simple to complex, ensuring there's something for everyone. We have an unlimited number of FREE puzzles in grid sizes from 3x3 to 9x9, offered as part of our Daily Challenge or selected especially for you. Playing our game is both challenging and rewarding, and mastering it requires understanding its unique rules and strategies.

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Ready to take on the challenge of KenKen? Our puzzles are universally recognized as the best available, and we invite you to play our daily puzzles and join our community of avid puzzle solvers. By playing now, you'll access an unlimited number and variety of KenKen puzzles, each offering a unique and engaging challenge. Whether you're a fan of Calcudoku or sudoku websites, or new to number puzzles, you’ll simply never be able to get enough of KenKen. Millions puzzles are played every day in newspapers around the world, puzzle books and online. Dive into our collection of free online puzzles, and discover the joy and satisfaction of solving puzzles. Play now and start your journey to becoming a KenKen master!

Will Shortz, NY Times Crossword Puzzle Editor and
NPR Puzzle Master Loves KenKen! Find out why

Rules For Playing KenKen®

The numbers you use in a KenKen puzzle depend on the size of the grid you choose. A 3 x 3 grid (3 squares across, 3 squares down) means you use the numbers 1, 2, and 3. In a 4 x 4 grid, use numbers 1 to 4. A 5x5 grid requires you use the numbers 1 to 5, and so on.

The numbers in each heavily outlined set of squares, called cages, must combine (in any order) to produce the target number in the top corner using the mathematic operation indicated (+, -, ×, ÷).

Here's how you play:

  1. Use each number only once per row, once per column.
  2. Cages with just one square should be filled in with the target number in the top corner.
  3. A number can be repeated within a cage as long as it is not in the same row or column.
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  1. To start, click on any square. A "number ring" appears with that grid's possible numbers. These numbers will also show up on the left side above the grid as the "Notes" box.
  2. Ready to fill a number in that square? Just click the one you want in the number ring. It will then appear in the middle of the square.
  3. Narrowed it down to a couple of numbers but still not totally sure? Click the numbers you want from the Notes box. They'll show up smaller in the square.

    Hints: Also in the candidates bar are , :
    • Clicking will place all possible Notes in the square.
    • Clicking will get rid of all the Notes in the square.
    • If you'd like to repeat a note (notes) in another square, simply drag the number from the original square to the new one. Click here to see the video of how it works.
  4. When you've ruled out one of your notes, click on it again in the Notes box. The number will disappear from the square.
  5. When you fill in a number in a square (by selecting from the number ring), any notes in that square will disappear.
  6. Changed your mind about a number? In the number ring, click the red eraser icon to clear the square.
  7. To hide the number ring, click the red "X."
  8. How to Use the Keyboard: You can enter numbers and notes by using the keyboard. Once you’ve selected a square, you can press shift and a number key to enter (or delete) that number as a note. Or, to just enter a number in a square, press that number on the keyboard (no shift). To delete a number or note, press C.
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