From the original publisher of daily Sudokus in the United States, USA TODAY presents 200 all-new Sudoku puzzle challenges in five difficulty levels. From the original publisher of daily Sudokus in the United States, USA TODAY presents 200 all-new Sudoku puzzle challenges in five difficulty levels. USA TODAY Sudoku Super Challenge 2 is a collection featuring 200 Sudoku puzzles in five difficulty levels from USA TODAY —the nation's newspaper. Features include: Introductory how-to section 200 9 x 9 Sudoku puzzles Comprehensive answer key