May -- Harper Collins publishes two KenKen books in the United Kingdom.

October -- KenKen is launched in the United States. St. Martin’s Press publishes four Will Shortz Presents KenKen books and three Will Shortz Presents I Can KenKen!! books for children. In the Introduction educator Marilyn Burns, the founder of Math Solutions, gives tips on solving the brain-twisting puzzle.

October -- Reader’s Digest becomes the country’s first magazine to run KenKen and its January 2009 cover proclaims: “The New Puzzle Sensation is Here!”

November -- The New York Times online starts running six interactive puzzles daily. Other newspapers with KenKen include Le Figaro (France) and El Pais (Spain). For additional newspapers, magazines and books with KenKen, see the “Partners” page.

January -- iToys introduces a handheld electronic KenKen game.

February -- The New York Times newspaper starts running KenKen, with two progressively difficult puzzles from Monday to Saturday.

February -- Dell Magazines releases original KenKen magazines: “Our new twist on sudoku brings you the ultimate in puzzle fun!”

March -- Watch for three new Will Shortz Presents Crazy for KenKen books.

April -- Capcom catches the puzzle craze and offers KenKen games for mobile phones, including the Apple iPhone