Killer Sudoku

Other than the normal sudoku rules, you also have to fulfill new condition which is the total of number in the cage have to be the same with the number in the upper left corner of the cage. Challenge you brain to finish this new puzzle.

There are 3 level of difficulty in the games:
- Easy for beginner who just start to play Sudoku / Killer Sudoku
- Medium for experience player who look for challenges
- Expert for sudoku master player who like full of challenges and want to train their logic

If you confused which cell contain which number, you also may save some notes in the games. You can focus your logic to finish the game and let the notes feature take care the remembering part for you.