Extreme Sudoku Puzzle Book - 1000+ Challenging Puzzles for Adults - Perfect for Travel, Relaxation & Brain Training

Put your problem-solving talents to the test with these 50 puzzles designed by a sudoku master for highly advanced enthusiasts. A mix of 9 x 9 and 16 x 16 square puzzles will challenge even the most skilled sudoku players. Solutions appear at the end of the book.