Hidoku is not Sudoku. It's a brand new puzzle game, played on a square or rectangle of any size. Your goal is to fill in the missing numbers from 1 to the maximum number (which is circled) by following one simple rule: consecutive numbers must touch each other either horizontally or vertically or diagonally. In this book there are 150 of these puzzles, which are all solvable by logic and no guessing is ever required.