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Sit & SolveŽ Hard KenKenŽ (Sit & SolveŽ Series)
Sit Solve Hard KenKen - Sit & SolveŽ Series Author:Tetsuya Miyamoto The tougher the KenKen, the better the brain workout! This collection of the popular numerical puzzles, featured in the New York Times, takes solving to a higher, harder level. Not for beginners!