Do you Sudoku? As the first newspaper in the United States to publish addictive Sudoku puzzles, USA TODAY continues to satisfy puzzle lovers with an all-new branded Sudoku book collection, "USA TODAY Sudoku 2."Features include an introductory how-to section followed by 200 nine-by-nine Sudoku puzzles targeting five different levels of difficulty. A comprehensive answer key completes the collection. "USA TODAY Sudoku 2" offers puzzlers the perfect distraction during noisy train commutes and while spending misplaced minutes waiting at the dentist's office.