Spider
- 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. The spider's body (thick line) is a Dutch whisper line: adjacent digits on the line must differ by at least 4. The spider's legs are arrows: digits on a thin line must sum to the value in the circular joint. Flies (black dots) separate cells whose digits are in a 1:2 ratio.