Each edition of the Great Sudoku Mix series contains a total of 100 puzzles in 15 different levels of difficulty: easy, medium and hard. The puzzles require either numbers, letters, hexadecimal digits or symbols. The puzzles are printed as large as possible so that there is enough space for number flags for each number field. All puzzles can be easily solved by excluding letters by process of elimination from other columns, rows, or boxes, leaving only one possible solution at a time. This book contains solutions as well as general game instructions for each of the puzzle variations.