Hard Killer Sudoku: 250 Sum Sudoku Puzzles for Adults - Paperback

by Sudoku Magazine (Author)

Killer Soduku (also known as killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) is like regular Sudoku, however, you must also place the numbers so that each dashed-line 'cage' adds up to the totals written in the corner of the cage.