Check out the fun logic puzzle known as KenKen®! KenKen® was invented by a Japanese math teacher wanting to help his students boost their logic and reasoning skills. This particular puzzle is a level 5, which can be a little challenging for beginners. We dare you to try it! Here's how to play:

Using the digits 1-6 in this 6x6 puzzle, fill the small squares with digits so as not to repeat a digit in any row or column, and so that the digits within each heavily outlined area will equal that area’s corner number when combined using the indicated operation. For more information visit www.kenken.com.

“KenKen® is a registered trademark of Nextoy, LLC, ©2009, KenKen Puzzle LLC”.  All rights reserved.