500 Killer Sudoku Puzzles - Easy To Hard. Going on vacation? Want to play? Here are 500 puzzles divided into three levels, when you progress through the book, the puzzles get harder and harder! This Puzzles Logic Grid Fresh, Fun, and Easy-to-Read For Adults. Killer Sudoku puzzles logic grid teaches you logical thinking and deductive reasoning skills. Killer Sudoku (Sums Sudoku, Sums Number Place, Samunamupure, Kikagaku Nampure) is a variant of the sudoku puzzle. The only distinction is that the sub-regions already contain the defined numbers which are the sums of the digits in some boxes of the puzzle. Get Started Today And Give Your Brain a Great Workout.