Killer Sudoku Puzzle Book for Adults: 400 Medium to Hard Puzzles 9x9 (Volume 1) - Paperback
by Alena Gurin (Author)
The book contains 400 excellent Killer Sudoku puzzles 9x9.
Killer Sudoku is based on the original Sudoku grid, with the same rules and numbers-1 to 9, but with an added mathematical challenge. The only difference is the killer Sudoku: additional numbers are given - the sums of values in groups of cells. The numbers contained in the group cannot be repeated. This variant also called "Sums Sudoku", "Sums Number Place", " Samunamupure ", "Kikagaku Nampure".