Herringbone
- Arrows
- Whisper lines
- Slow thermometers
The brief
Normal sudoku rules apply.
Along thermometers, digits must either stay the same or increase from the bulb end (slow thermos). All thermos are length 3 and end in the middle row. Some thermo bulbs may be hidden by arrow circles.
Digits along an arrow must sum to the digit in that arrow's circle.
Adjacent digits along a green line must differ by at least 5.