Consecutive neighbours are marks by a white dot.
1:2 ratio neighbours are marked by a back dot.
Neighbours summing to 10 are marked by an X.
All possible dots and crosses are given.
https://f-puzzles.com/?id=ychja2qx
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Solution code: Row 1 and row 9, no spaces
on 4. March 2022, 17:04 by Failure
Very nice! I love the negative constraint!
on 4. March 2022, 07:13 by Palooka
Really fun! Some great logic. Thanks!
on 4. March 2022, 00:33 by Squiz
That was a very fun puzzle that had a great flow. Thank you!
on 3. March 2022, 11:05 by Chelo
Very nice puzzle, thank you!..
on 3. March 2022, 09:26 by jackisaacbryan
Link added