Killer Sudoku — A Numbers Puzzle with a Twist

Killer Sudoku adds cage sums to classic Sudoku rules. Groups of cells (cages) must sum to a given total. No number can repeat within a cage. The classic row, column, and 3×3 box rules still apply.

Select Killer mode and choose Easy, Medium, Hard, or Expert difficulty. This variant adds a layer of arithmetic reasoning on top of standard Sudoku logic.