Sudoku puzzles are a tantalizing challenge - and an excellent way to develop and utilize your logical thinking skills. This publication presents 350 tough Sudoku puzzles for diehard players. The first 300 are traditional puzzles with the numbers 1 through 9. The final 50 puzzles are an extreme challenge because they contain letters, symbols, and various combinations of the two, which will test your ability to use your Sudoku wisdom with non-traditional characters. And the last five puzzles? They are super-sized, with both letters and numbers, to truly test your Sudoku skills. Sit down, with a pencil and eraser in hand, and immerse yourself in this wildly entertaining - and addictive - logic game!