Sudoku is the Numerical Crossword puzzle that has taken the world's puzzle masters by storm. The game challenges your mind in ways that few other games of skill and speed can. Sudoku provides a wonderful escape for those who love solving puzzles of all types. The Hagopian Institute is proud to present it's newest series: "Sudoku Junkie." The Sudoku Junkie Series features over 10 new Sudoku books that vary in difficulty for every level of Sudoku Junkie out there. This edition features 50 Hard puzzles which are perfect for any Sudoku lover who is trying to improve their skills. Enjoy