600 Sudoku Puzzles. 300 Hard and 300 Extra Hard, with solutions. in Bloomington, MN

Work your Sudoku playing level up from hard to extra hard difficulty with this book of 600 puzzles. There are 300 hard and 300 extra hard, printed with only 4 puzzles per page to leave space for notes. Solutions are given at the end of the book. 8.5" by 11".