Killer Sudoku is a popular logic-based puzzle game that combines elements of sudoku and arithmetic. In this game, players are presented with a grid divided into regions, much like traditional sudoku puzzles. However, instead of filling in the grid with numbers 1 through 9, players must use arithmetic clues provided within the grid to determine the correct numbers to fill in each cell.

The objective of killer sudoku online Sudoku is to fill in the grid so that each row, column, and outlined region contains the numbers 1 through 9, with no repetition. Additionally, each outlined region is assigned a "target sum," and the numbers within that region must add up to the target sum.

Players must use deductive reasoning and logic to solve the puzzle, considering both the standard sudoku rules and the arithmetic constraints provided by the target sums. Killer Sudoku puzzles come in varying levels of difficulty, ranging from easy to challenging, offering a satisfying mental challenge for puzzle enthusiasts of all skill levels.

Overall, Killer Sudoku is a stimulating and addictive puzzle game that tests players' numerical and logical reasoning skills while providing hours of entertainment and mental stimulation.