German Whispers: Adjacent digits along a line must differ by at least 5.
Thermometers: Digits along a thermometer must increase starting at the bulb end.
f-puzzles: https://f-puzzles.com/?id=ygbcd3zj
CTC: https://tinyurl.com/57jbtfyb
Solution code: Row 1 + Column 7 (18 digits)
on 3. September 2021, 21:00 by SSG
Added CTC app link.
on 26. July 2021, 04:44 by SSG
Added tags
on 24. July 2021, 15:37 by SSG
Fixed typo in solution code.