Killer Sudoku is a Sudoku without clues; instead, it has special regions, delimited by dotted lines, called cages. Each number sequence in a cage must sum to the total indicated in the top left of the cage. No number repeats itself in a cage . The usual rule of Sudoku applies: each number from 1 to 9 appears only once in each column, row, and 3x3 box. This book is targeted at the Killer Sudoku enthusiast who will find plenty of puzzles to fulfill his passion.