Thermometers: Digits along a thermometer must strictly increase starting from the bulb.
Renban: The digits along a purple renban line must form a non-repeating consecutive group.
Palindromes: Digits along a gray palindrome line must occur in the same order when read from either end.
f-puzzles: https://f-puzzles.com/?id=yev4wntt
CTC: https://tinyurl.com/38b5z3ct
Solution code: Row 3 + Column 9 (18 digits)
on 3. September 2021, 20:52 by SSG
Added CTC app link.
on 20. August 2021, 14:16 by StefanSch
There is one cell with amazing influence on the whole board. Nice logic!
on 12. August 2021, 15:10 by henrypijames
Despite some wild goose chase at the start, I found the point of entry sooner than excepted. The rest was still quite hard - solid 4 stars.