Killer Sudoku

A book filled with killer Sudoku, the most challenging of the Sudoku variants Some see it as the most pure form of number and logic puzzling: start with no numbers filled in on the grid and use logic and simple addition to fill in all the numbers. The original rules of Sudoku apply: each column, row [...]
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A book filled with killer Sudoku, the most challenging of the Sudoku variants Some see it as the most pure form of number and logic puzzling: start with no numbers filled in on the grid and use logic and simple addition to fill in all the numbers. The original rules of Sudoku apply: each column, row, and 9x9 box must contain the numbers one to nine only once.