Futoshiki, or "More or Less", is a grid puzzle similar to Sudoku in that each column and row must contain exactly one instance of each number. The only difference being that in between some squares there are less-than () symbols that act as clues. This book contains 200 Medium 9x9 puzzles, 4 per page. We are sure you will find these puzzles offer an entertaining yet effective way to exercise your brain and keep your mind sharp. All puzzles have been checked to ensure there is only one valid answer. Find more pencil puzzle books on Brainy's website www.BrainysLogicPuzzles.com