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.As you get into tougher puzzles, you’ll notice small clues hiding in the sums and operators that nudge you toward the right combinations. Some cages fall into place instantly, while others make you juggle a few possibilities before everything lines up. It becomes a steady, thoughtful process as the grid slowly tightens and the solution starts to show itself.
