Large Print Hard Killer Sudoku: 100 Challenging Sumdoku Puzzles for Experts - Paperback
by Oliver Hammond (Author)
100 Large Print Hard Killer Sudoku Puzzles
Killer Sudoku (also called killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) is a number placing logic puzzle based on a grid with 9x9 cells. The object of the game is to place number1 to 9 in the empty cells so that each row, each column, and 3x3 box contains the same number only once. Besides, the sum of all numbers in a cage must match the small number printed in the corner, and the filled-in digits must be unique.
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