Antiknight: Cells separated by a chess knight's move may not contain the same digit.
Arrow: Cells along an arrow must sum to the digit in the connected circle.
Between Lines: Digits on the line must have values between those of the two circles at the ends of the line.
Little Killer: Arrows outside the grid indicate the sum of all digits along the indicate diagonal. The variable X has the same value in all locations it appears.
Odd/Even: Cells marked with a gray circle must contain odd digits. Those marked with a gray square must contain even digits.
Palindromes: Green lines indicate palindromes. The sequence of digits along each of these lines must read the same in either direction.
Thermometers: Digits along a thermometer strictly increase from the bulb end.
XV: Cells connected by an X must sum to 10. Those connected by a V must sum to 5. Not all possible XV clues are given.
Note that clues are straight lines.
f-puzzles: https://f-puzzles.com/?id=yhsswud8
CTC: https://tinyurl.com/3uh96tby
Solution code: Column 5, row 8
on 3. September 2021, 21:11 by SSG
Added CTC app link.
on 26. July 2021, 04:54 by SSG
Added tags. So, so many tags.
on 17. June 2021, 17:35 by SSG
Edited to clarify the palindrome rule.
on 17. June 2021, 16:30 by SKORP17
Das ist ziemlich unklar :
Digits along one of these lines must read the same in either direction.
nur 1 (so ist das eigentlich lt. Beschreibung) von 6 oder jeweils 1 von den beiden gekreutzten oder doch alle 6