Hoffman's Difficult Sudoku 1: 250 Fun Puzzles

Difficult Sudoku is a book of 250 classic puzzles created and published by sudoku expert George Hoffman. Each puzzle is guarantied to have only a single solution. To pack the most punch, the puzzles are sized at an efficient six grids per full-sized page. If you'd like a roomier puzzle, check out one of our large-puzzle books.