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KenKen

KenKen™ is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto as an 'instruction-free' method of training the brain and was later published in The Times in March 2008.

The objective is to fill a grid in with the digits 1 through 6 such that:

If you want to have a go you can find online puzzles at Kenken.com

Kenken Books

The "Times": KenKen: The New Brain-training Puzzle Phenomenon
Puzzle books by KenKen creator Tetsuya Miyamoto. Four books of puzzles available. From Amazon.co.uk

Will Shortz Presents the Little Gift Book of Kenken
250 logic puzzles that make you smarter from the godfather of Sudoku. From Amazon.co.uk and Amazon.com

Will Shortz Presents Kenken
100 logic puzzles that make you smarter. From Amazon.co.uk and Amazon.com

The "Times": Junior KenKen:
Brain training for young minds by KenKen creator Tetsuya Miyamoto. From Amazon.co.uk

Will Shortz Presents I Can KenKen!
KenKen helps children improve concentration, logic and arithmetic skills. Amazon.co.uk and Amazon.com

Sudoku 2019 Gift Ideas

Sudoku Gift Ideas
for Christmas 2018

Sudoku Quotes and Tips
Addictive is not a word that I would use.
Wayne Gould, Father of the current Sudoku craze.