Region Sum Lines
Box borders divide the blue line into segments with the same sum.
German Whispers
Neighbouring digits on a green line have a difference of at least 5. Digits can repeat on the line if allowed by the other rules.
Odd
A cell with a gray circle contains an odd digit.
Kropki Pairs
Digits joined by a white dot are consecutive. Digits joined by a black dot are in a 1:2 ratio. Not all dots are given.
XV Pairs
Digits joined by an X sum to 10. Digits joined by a V sum to 5. Not all Xs and Vs are given.
Link:
SudokuPad
Solution code: column 9
on 6. May 2024, 20:18 by abadx
As being said already, closer to 3 stars for me
on 5. May 2024, 07:06 by SamuPiano
Cool puzzle! Lots of fun, thanks :)
on 5. May 2024, 01:38 by wuc
Same for me. A rather long look ahead was necessary. The other parts flow very smooth. Mice work thx.
on 4. May 2024, 23:42 by VitP
there are 2 keys to unlock the door. the first is "easy", and fairly obvious. the second one, i could only find after casing a binary cell through a long chain. this is also an "obvious" test, and it works first time.
on 4. May 2024, 19:01 by Playmaker6174
I did find it harder than casual 2 stars, but it was still fun at the end :)
on 4. May 2024, 13:52 by Florian Wortmann
Fun fact: without the X and V in box 7, this puzzle has 430 solutions.