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Everyone loves a challenge when it comes to sudoku, the insanely addictive puzzle craze that's taken the world by storm. Riding hot on the heels of the overnight success The Everything Giant Sudoku Book comes The Everything 15-Minute Sudoku Book and The Everything 30-Minute Sudoku Book. Packed with over 200 puzzles, both volumes challenge puzzlers to race the clock and fill in the grids in 15 and 30 minutes or fewer. Along with easy-to-understand instructions on the rules and strategies, readers get insider tips for quicker and slicker solving. Readers shouldn't panic if they can't solve each puzzle in 15 or 30 minutes--by the time they finish these books they'll be speedy, speedier, speediest sudoku masters!