The objective of Sudoku 16x16 is to fill every row, column and box (4x4grid) with numbers 1-16 and each row, column, and box must have each number exactly once. This Sudoku book is packed with the following features: - 100 Easy to Hard Sudoku 16x16 puzzles.- One puzzle per page (8.5 x 11 inches) and large print font for prevention of eye-strain.- Answers to every puzzle are provided.- Each puzzle is guaranteed to have only one solution.- Includes free bonus puzzles you can download book (Tons of Sudoku Puzzles for Adults & Seniors) - Includes free bonus puzzles you can download book (Word Search With Hidden Message: 102 Puzzles for Adults and Seniors)