This genre shares some similarities with @Menderbug's [Loom].
## [crosswall] puzzles
### site.author
W=4x4&L=(0)11(3)2(1)1(4)11(2)1&SSE=7LDRU12LDDLURRRUL3DDLLUURR&G=crosswall&A=Pedro&D=2023-05-11&K=Solyu&N=154&T=Fingers
W=4x4&L=(2)12(3)2(1)6(1)2(3)3(4)2(2)6(1)2&SSE=14DDLDDRRULLLUURRRDDRUUULL&G=crosswall&A=Pedro&D=2023-05-10&N=155&T=Weave
### @AnuragSahay
W=6x6&L=(6)1(3)2(1)17(2)3(1)14(6)1(7)19(4)15(5)19(1)4&G=crosswall&A=Anurag_Sahay&D=2024-02-27&F=3
### @PinkHoodie
W=16x6&L=(1)1(3)2(2)20(1)13(10)20(9)19(7)2(10)13(8)2(7)19(5)2(8)13(6)2(5)19(1)2(6)13(4)2(3)19(10)2(9)13(2)2(1)19(10)20(9)13(8)20(10)2&SSE=11RDLDRRURRULLURURRDDRDRRDDRRUULLUURDLLULURDRURDRDDRDDLDLLLUULULLDLDRRDLLLULDLLURULUUR16LLDRRU75LDLURURRDRDDDDLUULLDRUUU&G=crosswall&A=PinkHoodie&D=2024-02-27&F=3&O=No_Number_Crosswall&T=Spiaj
W=16x6&L=(6)2(1)3(6)14(5)1(6)19(5)1(5)17(6)1(5)15(6)1(6)17(5)1(6)19(5)1(5)17(6)1(5)15(6)1(6)17(5)1(6)19(5)1(5)17(6)1(5)15(6)1(6)17(5)1(6)19(5)1(2)14(5)3&SSE=27DLLDLURURR6URRDLDDDDDRRUUUUUURRDDDDDRRURRRUUUULLLLDRDDRRDDLDRURDRUURULULLULDLLDDLLUULLDDLLUULLDDLULDDRRRDRULUUUUR24RDLU&G=crosswall&A=PinkHoodie&D=2024-02-27&F=2&O=No_Number_Crosswall&T=Hexpent
## Variants
### ´´heterocut´´
V=heterocut
W=4x4&L-AD=w3w3w3&L-AL=w5w4&L-AR=w7w3&L-AU=w10w2&SSE=19RDDDLDLLLUURRULDDRRUULUR&G=crosswall&V=heterocut&A=PinkHoodie&D=2024-04-21&F=2&O=Heterocut&T=CrossDiff
## Acknowledgements and Changes
**2023-05-11** Thanks to @Solyu for important feedback on the implementation, and to @Wand125 for connecting us.
**2023-05-15** Thanks to @semiexp for noticing that the contiguous mark should have been allowed at the border (fixed), and to @solyu for providing an example where the **winding number** (how many times the loop winds around a point) is not equivalent to the **crosswall number** (minimum number of loop crossings that would be needed to reach the outermost area), and @Menderbug for suggestions to improve the implementation on mobile.
**2023-05-18** Added two additional shading colours
**2023-06-28** Thanks to @MartinEnder for noticing the board rotation wasn't working (fixed)
**2023-09-16** The default font changed, for consistency across all devices. This also solved an issue reported by @DonnyTheNuts on ipad.
**2023-11-13** Improved highlighting with multiple crosswall numbers per area, changed highlighting to confirm correct areas, added variegation and an extra rule panel.
**2023-11-13** Better calculation of the crosswall number for boards with removed tiles
**2023-11-14** Variant *directions* now works with any genres with crosswall-like lines.
**2023-12-06** Crosswall aux mark button colour restored, a regression found by @XSheep. Also, numbers can no longer be placed on top of absent tiles (@PinkHoodie).
**2023-12-07** Encoding fix for the directions variant, ensuring all arrows on the puzzle border are kept (@PinkHoodie).
**2023-12-11** Snake variant now displays correctly for non-tile-centered line genres.
**2023-12-31** Thanks to @Menderbug for finding a very recent regression that wasn't covered by a unit test, now fixed.
**2024-01-16** Variant ´´match-parity´´ promoted to global, so it can now be used in genres such as [Nurikabe Loop], a suggestion by @PinkHoodie
**2024-02-27** A recent regression reported by @Edderiofer was corrected (cause: ongoing work with input modes) and @Anurag sent a classic 6x6 - thank you!
**2024-02-29** :::puzzletters @PinkHoodie sent two extra-wide crosswalls. Thank you!
**2024-03-01** @EliDoris and @Pedro collaboratively [modernised the rule panels|../panels#modern] for [Crosswall]
**2024-04-26** :::puzzletters @PinkHoodie sent 1 puzzle using variant ´´heterocut´´!
**2024-07-11** The ´´crosswall´´ variant is now working correctly (@AnuragSahay), cause: missing dependency in variant rule
**2024-09-28** Corrected some errors with the number dial on iPad after feedback from @Jubale - thank you!
**2025-01-14** Number clues no longer absolutely required for answer check to trigger in [Crosswall] (@PinkHoodie's ´´heterocut´´puzzle was updated accordingly)