About Killer Sudoku
Sudoku meets kakuro. No given numbers at the start - instead, you get "cages" with sum targets. You need to figure out which numbers go where using both sudoku logic and arithmetic. Properly brain-bending. Practice at your own pace.
How to Play
Fill the 9x9 grid with standard sudoku rules (each row, column, and 3x3 box has 1-9). Plus: the numbers in each dashed cage must add up to the small number shown, and you can't repeat digits within a cage. Start by figuring out which number combinations can make each sum.
Killer Sudoku Tips
Casual Killer Sudoku is great for learning cage combinations without time pressure. Start by listing possible sums for each cage and reduce them as you place digits.
Look for cages that cross or overlap boxes. They often create strong constraints that unlock the rest of the grid.