Killer Sudoku Pro is a logic puzzle based on a 9x9 grid with several prefilled numbers. Each puzzle consists of a 9x9 Sudoku grid containing areas surrounded by the same background color (cages).
How To Play
Killer Sudoku Pro builds on traditional Killer Sudoku by adding a twist: the numbers inside a shaded cage must combine through addition, subtraction, multiplication, or division to match a target number and its corresponding operator displayed in the top-left corner of the cage. For instance, if the cage marker shows "5", the numbers within might add up to 5, like 1 and 4, or 2 and 3. With operations like subtraction or division, start with the largest number and either subtract or divide by the other numbers—so, a cage marked "3-" could work with the numbers 6, 2, and 1 because 6 - 2 - 1 equals 3. Importantly, numbers within a cage cannot repeat, so a combination like 1, 1, and 6 for an "8" is invalid.
