Normal sudoku rules apply.
Digits along the thermometer ('4') must increase from the bulb end.
The grey line ('9') is a palindrome that reads the same in both directions.
Digits in cages sum to 7; negative constraint applies -- no unmarked dominoes sum to 7.
Digits separated by a white dot differ by 1 (not all dots are shown).
Have fun, leave a comment if you enjoy the puzzle!
Solution code: Row 4 followed by Row 9
on 4. September 2022, 00:18 by GorgeousNicko
I particularly liked the negative 7 constraint - not sure why :)
on 26. August 2022, 18:48 by drbs
If I were Simon, I would start the puzzle by putting a 3 in the corner, sing the song and see where it takes us from there. :-)
on 26. August 2022, 17:58 by Ragna
Very nice puzzle :-))