You're familiar with hexadecimal (16x16) Sudoku. This book has a twist. There's a prominent technique used to solve Sudoku puzzles that requires the memorization of a list of characters and the process of elimination to solve for a single cell. I call it "Memory Sudoku." I designed this book to focus on that single logic tool. The 100 puzzles in this book require no other logic than Memory Sudoku logic. Ten levels of difficulty. For all ages. Enjoy