Question marks were not included in this implementation since they carry no information - not every number clue needs an opposite pair.
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This puzzle uses the new loop-to-path variant!
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Acknowledgements and Changes
2023-12-03 Thanks to Martin Ender (Menderbug) for substantial feedback on the first draft of Cross Border Parity Loop, yielding several improvements!
2023-12-03 Thanks to PinkHoodie for sending in the first Cross Border Parity Loop puzzle in record time, and for suggesting given (optional) white/black marks
2023-12-03 Thanks to Lennard Sprong (X_Sheep) suggesting adjustments to the given colour marks to make them less heavy.
2023-12-11 The full and snake variants are now totally compatible with multi-line genres like Cross Border Parity Loop (PinkHoodie)
2023-12-11 Variants required-whites and required-blacks were added to all pearl genres, an implicit idea by hutthutthutt
2023-12-11 puzzletters PinkHoodie sent a puzzle to mark the hex variant of Cross Border Parity Loop
2024-01-01 A bug with the new loop-to-path variant found by PinkHoodie when making the puzzle that is now listed. Fixed. Thank you!
2024-03-05 A new puzzle was sent by PinkHoodie
2024-03-09 A recent visual regression found by PinkHoodie was corrected (cause: changes to the number templates to support an upcoming number update)
2025-03-23 puzzletters PinkHoodie shared 1 Cross Border Parity Loop (classic) puzzle for Enigmarch 2025!