The implementation deliberately recasts this genre as a yajilin-like (full, shade-no-adjacent) to more easily use the full power of the variant system.
So players are asked to mark unused cells via shading, which is of a much lighter colour (thus reapproaching the original theme).
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walls
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walls,lines-4
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Acknowledgements and Changes
2024-05-14 Thanks to Anurag Sahay for extensive feedback on the implementation that led to important fixes and even new variant pipe-partial
!
2024-05-16 Anurag Sahay crafted the modern rule panels - thank you!
2024-05-16 PinkHoodie made the walls
variant panel and sent 2 puzzles for the rollout - thank you!
2024-05-18 puzzletters PinkHoodie sent 2 classics plus 1 puzzle using variant walls,lines-4
!
2024-05-20 Subtle design change in the pipe symbols, introducing a small gap between two connected pipes, so that the need to draw a segment there becomes more apparent. Thanks Anurag Sahay for mentioning this situation.
2024-05-24 PinkHoodie included this genre in a puzzle series themed after the 26 letters of the alphabet!
2025-03-03 Encoding Thanks to Walker Anderson for noticing hex
White Link puzzles with an older encoding were not correctly migrated (fixed)