This is my first puzzle! So: please be kind ;-).
I was watching a CTC video, when I thought: what if different sets of objects in a puzzle must have opposite parity? So, these rules flew from that thought:
Normal Sudoku rules apply.
Cells with grey circles must contain odd numbers, cells with grey squares must contain even numbers.
Normal arrow rules apply (digits on the arrow must sum up to the digit in the circle of the arrow), but: the circles of both arrows must have opposite parity.
Normal kropki rules apply (digits next to black dots must have a ratio 1:2), and normal thermo rules apply (starting with the bulb, digits along the thermometer must increase in value), but: the totals of the digits of each kropki-dot must have opposite parity from the totals of the digits on each thermometer.
Red cage totals must have opposite parity from green cage totals.
No negative constraints apply.
Solution code: Row 4 (from left) and column 8 (from top) - 18 digits without spaces or punctuation
on 25. May 2022, 05:25 by Will Power
Thanks to assentior for setting. Nice first puzzle.
on 24. May 2022, 19:50 by assentior
Thanks for the feedback!
Thank you SKORP17 for pointing out the flaw with one of the thermometers.
Thank you Will Power for your help with the F-Puzzles link.
I had to change the size and position of the cages as well.