Why the caged bird whispers
by FullDeck and Missing a Few Cards
Heartburn
- Killer cages
- Thermometers
- Whisper lines
- Renban lines
- Thermo
- German whisper
The brief
Normal sudoku rules apply. Each row, column, and box must contain a complete set of the digits 1-9. Normal killer cage rules apply: digits in cages cannot repeat and must sum to the number shown in the upper left corner of the cage. Digits along a thermometer must strictly increase from bulb to top. Digits along the thermometer do not have to be consecutive. Green lines are German whispers lines. Adjacent digits along the line must differ by 5 or more. Purple lines are Renban lines. Digits along a renban line form a set of consecutive digits in any order.