Half Dozen
- Killer cages
- Whisper lines
- X-sums
The brief
Normal sudoku rules apply.
Whisper: Adjacent digits along the grey line must differ by at least 3.
Killer: Digits in cages must sum to the small clue in the top left corner.
X-Sum: Clues outside the grid give the sum of the first X digits placed in the corresponding direction, where X is the first digit in that row or column.