Guess Who?
- Kropki dots
- Whisper lines
- Parity lines
- Nabner lines
- Negative constraint
The brief
Normal sudoku rules apply.
Every question mark represents a different constraint.
Nabner: Digits on the golden line cannot repeat, and no two digits on the line can be consecutive, regardless of their order along the line. German whisper line: Adjacent digits along the green line must differ by at least 5. Parity line: Adjacent digits along the red line must alternate in parity (odd/even). Thermometer: Digits along the grey line must increase from the bulb to the tip, which can be on either end and are to be deduced. Region sum line: Box borders divide the blue line into segments with the same sum. Combo line: The turquoise line acts as both a German whisper line and a Region sum line, as described above.
Digits separated by a black dot must be in a 1:2 ratio. All black dots are given.