Potpourri ( 芳香组合)
- Killer cages
- Kropki dots
- Whisper lines
- Little killers
- Odd and even cells
The brief
Normal Sudoku rules apply.
ROTATIONAL SYMMETRY- Numbers 180 degrees apart on the grid sum to 10.
DUTCH WHISPERS- Numbers on the red line are at least 4 apart from their neighbors on the line.
KILLER CAGES- Numbers in cages sum to the number in the top left corner of the cage.
LITTLE KILLER- Numbers outside the grid are the sum of the numbers on the indicated diagonal.
KROPKI PAIRS- Numbers with a black dot between them are in a ratio of 2:1. Not all possible dots are given.
EVEN- Numbers in cells with a gray square are even.