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- Kropki dots
- Thermometers
- Arrows
- Whisper lines
- Odd and even cells
The brief
Normal Sudoku rule apply.
ARROWS(+)-Numbers on arrows sum to the number in the arrow's circle. Also, numbers on arrows decrease toward the arrow tip.
THERMOMETERS- Numbers on thermometers increase from the bulb end.
KROPKI PAIRS- Numbers with a white dot between them are consecutive. Not all possible dots are shown.
GERMAN WHISPERS- Numbers on green and blue lines are at least 5 apart from their neighbors on the line.
DUTCH WHISPERS- Numbers on red and yellow lines are at least 4 apart from their neighbors on the line.
SUMMED REGIONS(+)- Numbers in dashed regions sum to the number in the top left corner of the region. Numbers may repeat in regions, if other rules allow.
EVEN- Cells with a gray square are even.