Big Book Killer Sudoku - 500 Hard Puzzles 9x9 (Volume 4)

Killer Sudoku (also called "Sums Sudoku", "Sums Number Place", "Samunamupure", "Kikagaku Nampure") is a puzzle that combines elements of Sudoku and Kakuro. Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic, the hardest ones, however, can take hours to crack. In Killer Sudoku, sub-regions have specified sums, and no number can be repeated within a region. The puzzle books series contain:
- 500 Hard Puzzles
- Handy 6 x 9 inch Book Layout
- 6 Puzzles per Page
- Ideal for Experts The book is for those who like logic and math problems. Decide, developing and improving.