1 is not the loneliest number
- Killer cages
- Whisper lines
The brief
Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.
Cages: digits in cages must not repeat and must sum to the number in the top left corner of the cage, if given.
Whisper-5: adjacent digits along a green line must have a difference of at least 5.