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 no. 1 newspaper. Features include:Introductory how-to section200 9 x 9 Sudoku puzzlesComprehensive answer key | Usa Today Sudoku Super Challenge 2 by USA USA TODAY, Paperback | Indigo Chapters