The Pair Orchard
- Anti-knight
- Kropki dots
- Whisper lines
The brief
Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.
Cells which are a chess knight's move apart may not contain the same digit.
The green lines are German Whisper lines: adjacent cells along a line must contain digits which differ by at least 5.
The black dot separates digits where one of them is double the other. Not all black dots are necessarily given.