Killer Sudoku is a variation of traditional Sudoku that combines elements of both logic and arithmetic. In this puzzle, the grid is divided into regions, each marked with a dotted line and a number that indicates the sum of the digits within that region. The objective is to fill the grid with numbers from 1 to 9, ensuring that each row, column, and 3x3 box contains unique digits. Unlike standard Sudoku, where only placement matters, Killer Sudoku requires players to consider the sums of the regions while adhering to the same rules of uniqueness. This adds an extra layer of challenge, making it a popular choice for puzzle enthusiasts.