Your goal is to fill the grid with numbers like in classic sudoku and also make sure the sum of numbers in cages (areas separated by dotted lines) is equal to the number in the upper left corner of that cage.
If you are interested in playing number games or math puzzle games, this Killer Sudoku is exactly for you! Killer Sudoku may be a little bit harder than a classic sudoku puzzle game.
Killer sudoku (also named sumdoku, addoku, cross-sum or samunamupure) is a logical puzzle game that combines elements of sudoku and kakuro.
Even you didn't play Killer Sudoku before, you'll become a Killer Sudoku master in no time.
The sum of all numbers in a cage must match the small number printed in its corner.