Calcudoku Puzzles

Calcudoku puzzles are a combination of arithmetic and logic type puzzles. Each calcudoku grid has blocks surrounded by bold lines. Each block has a math problem to solve based on arithmetic operations: addition, subtraction, multiplication or division. Numbers are placed in the blocks so that they occur only once in each row and once in each column. Similar to Sudoku. However, within each block, numbers can occur more than once. Remember: follow Sudoku puzzle rules for rows and columns.



Happy Summer!

It's official! Summer is HERE! Our Puzzle Book Ninja team wishes everyone a safe and happy summertime.

To help with the fun times, our Summer Activities Puzzles collection is up and ready for fun with friends and family. Check out ALL the fun summer activities to do with kids.

And, just when we thought we couldn't be more excited, our new Puzzles for Grandparents category is now live with links to many puzzles to engage the brain. We are currently developing unique puzzles that are sure to delight kids of all ages!

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