## A Week of KenKen, Day 1: Introduction

Welcome to A Week of KenKen (AWOKK). Every day this week, the MJ4MF blog will feature a new post about the number puzzle that Sudoku wishes it could be. That’s right — seven days, nothing but KenKen.

Here’s a list of the posts that you’ll see in coming days:

• Day 1: Intro (that’s today!)
• Day 2: The KENtathlon
• Day 3: KenKen Times
• Day 4: My KenKen Puzzles
• Day 5: Harold Reiter’s Puzzles
• Day 6: KenKen Glossary
• Day 7: KenKen Puzzle for 2016
• Day 8: KenKen in the Classroom

If the Beatles got nothin’ but love, babe, eight days a week, then I can certainly have a week with eight days of KenKen. Deal with it.

Today is an introduction, for those of you unfamiliar with KenKen. Here are the rules of the puzzle:

• For an n × n grid, fill each row and column with the numbers 1 through n. A number may not be repeated in any row or column.
• Each heavily outlined set of cells, called a cage, contains a mathematical clue that consists of a number and an arithmetic operation: +, –, ×, or ÷. The numbers in that cage must combine (in any order) to produce the target number using the mathematical operation indicated.
• Cages with just one cell should be filled with the target number.
• A number may be repeated within a cage, provided it’s not in the same row or column.

The New York Times crossword puzzle editor and Weekend Edition puzzlemaster Will Shortz explains KenKen in this short video:

Ready to try for yourself? Here’s a simple puzzle, which is dubbed an “easy” puzzle from the KenKen website:

Too easy? Here’s a slightly more interesting one that I created:

Did that whet your appetite for more? If you were a kid who could’ve held out for several minutes to get two marshmallows, then check back tomorrow for the next installment. But if you were a kid who just couldn’t wait and would’ve gobbled that single marshmallow immediately, then here’s your instant KenKen gratification:

Till tomorrow, happy solving!

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The Math Jokes 4 Mathy Folks blog is an online extension to the book Math Jokes 4 Mathy Folks. The blog contains jokes submitted by readers, new jokes discovered by the author, details about speaking appearances and workshops, and other random bits of information that might be interesting to the strange folks who like math jokes.

## MJ4MF (offline version)

Math Jokes 4 Mathy Folks is available from Amazon, Borders, Barnes & Noble, NCTM, Robert D. Reed Publishers, and other purveyors of exceptional literature.