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From Barnes & Noble
In 2004, Japanese math teacher Tetsuya Miyamoto devised KenKen, an arithmetic and logic puzzle that he believed, quite rightly, as a brain-trainer. Now, this challenging recreation has arrived in America in four graded version. Novices are invited to jump in with the White Belt version, then test their skills with three puzzle books of ascending difficulty: Green Belt KenKen (9781454904182); Brown Belt KenKen (9781454904199); and Black Belt KenKen ( 9781454904205). Each inexpensively priced paperback contains 300 puzzles.