When solving [subway], please imagine yourself as a city planner, striving for an harmonious subway network to keep your beloved citizens safe and mobile, while preserving precious parks and gardens.

The earlier genre [Metro|https://puzsq.logicpuzzle.app/?kind=265] by Yusuke Yamamoto -- Puzzle Communication Nikoli vol.164 (2018-09) shares some similarities with [subway], albeit coincidental -- thanks @Wando!


## [subway] Puzzles

### @Portponky

This is the original set of [subway] puzzles created by @Portponky, upon inventing the genre. Later, a couple non-uniquenesses were corrected.

W=4x4&L=z10z1z1z2&G=subway&A=Portponky&D=2020-12-29&T=Example
W=5x5&L-V=s10s2s16s4&SSE=1UUEERSSDDWLLLN&G=subway&A=Portponky&D=2021-05-15&T=Modified_Untitled
W=5x5&L-V=s9s5s2s5&SSE=3UERSDDLLN16WLNUEEERSDWLD&G=subway&A=Portponky&D=2020-12-29
W=6x6&L=z1z1z22z1z3z5z1&L-V=s12s3s11&SSE=1UUUEERSDSSDWLLNNUEEERSDDWLWWLN&G=subway&A=Portponky&D=2021-05-09&K=Toph_Wells,Pedro_PSI&T=Modified_Untitled
W=6x6&L=z4z13z6&L-V=s23s1s1&SSE=2UERSSREUNLWWDSSREUNLWWLN&G=subway&A=Portponky&D=2020-12-29
W=7x7&L=z19z1z1z1z5z7z12z1&L-V=s13s16s14&G=subway&A=Portponky&D=2020-12-29
W=6x6&L=z5z1&L-V=s30s1s2s6&SSE=1UUUEERSSSDDWLNNNUERSDDDWLLN&G=subway&A=Portponky&D=2020-12-30
W=6x6&L=z1z6z7z5z6z5&L-V=s25s1&SSE=1UUUERSSREUNLWWDDDSREEUNLWDDWLN&G=subway&A=Portponky&D=2021-04-20&K=Pedro_PSI&T=Modified_Untitled
W=6x6&L=z7z1z1z1z1z2z11z1z3z1&L-V=s24s22&SSE=1UUUUERSSDWDSREUUUUNLLWDSSDWLLN&G=subway&A=Portponky&D=2020-12-30
W=7x7&L=z3z6z2z5z2z5z2z6z7z7z1z1z1&L-V=s11s1s5s5s21&SSE=58NLLULLWWDSREEULLNNUERSSDREUNLLWWWDSSSRRREU&G=subway&A=Portponky&D=2021-05-12&K=Aspeon,Pedro_PSI&T=Modified_Untitled


### site.author

These puzzles were made afterwards!

W=9x9&L=z0z11z2z2z4z1z2z2z1z12z2z2z2z4z4z4z6z10z3z1z1z1z1&L-E=s21s29s2s28s3s49&L-V=s15s13s13s10s7s3s10&SSE=56RUNNLWWDSRDLWDSREULURDRDSSREUUUUUUUNLLLWDDRUERSDWLURSDWLDWWLLNNUUEERRDLUUUNLWDDDSSRDSSREEUNLLLURDDRUULU&G=subway&A=Pedro&D=2021-06-27&F=5&N=70&T=Knitting
W=8x8&L=z11z3z3z3z5z5z1z3z1z5z1z7z1z8z4z1&L-V=s21s10s2s7s2s7s2s8&SSE=79NLLWDDRDDDRREUNLLUUNLWDWSDDREUULUUNLWDSWDSRDSREULNUULWDWDSRERSRREUNUEUU&G=subway&A=Pedro&D=2021-06-03&F=5&N=64&T=Knot_theory
W=7x7&L=z6z8z3z6z1z1z6z13z4&L-V=s19s1s6s3s5s3s6s1&SSE=1UEEEERSDWWWLNNUUEERRRSSDDDDWLNNNNUERSSSDWWLLLN&G=subway&A=Pedro&D=2021-05-20&F=2&N=62&T=Central_Park
W=7x7&L=z6z5z4z1z3z8z7z1z1z5z1z1z4&L-V=s27s1s7s1&SSE=62DWLWWDWLNUUUERDSSRDWLNUUEERRSDWLUNNLUERRRS&G=subway&A=Pedro&D=2021-05-17&F=4&N=61&T=Butterfly
W=7x7&L=z1z1z1z4z1z9z7z7z2z4z5z3&L-V=s21s1s3s1s27&SSE=1UUUEEERSSSDDWWLLNUNUEERERSDWDDWLNNUERSDWWWLN&G=subway&A=Pedro&D=2021-05-13&F=4&N=60&T=Winding_roads


### @CoreyHardt
W=6x6&L=z0z4z13z13z2&L-V=s9s29s2&G=subway&A=Corey_Hardt&D=2021-05-13&T=Small_Parks






## Variants

//### Quarter Parks
//These puzzles make use of the internal "quarter park" representation, for an extra challenge.

//#### site.author
//W=9x9&L=p16p1p55p1s3p32p25p1p1p1p3p1p3p1s12s4p10p1p1p1p3p1p3p1p36p1s8s12p16p1p26p1p3p1p1p1s22p8p1p3p1p1p1p27p1p6p1p1p1p3p1s8p15p1p6p1p1p1p3p1p23p1p4p1p7p1s8p15p1p4p1p7p1p26p1p5p1p1p1p1p1s10s2s10p4p1p5p1p1p1p1p1p25p36p6p1p29p7p1s24&SSE=2UUUERREERRSDSDDWWLNNNUERSSSSDWLLLLNUUNNNUERRRERRRSDDWDWWWLWLNN&G=subway&A=Pedro&D=24/05/2021&F=3&N=63&T=Optical

//#### @BoredMatt
//W=7x7&L=p46s16s6p7s49s54s6p37p1p2p29s43s6p4p1s47&SSE=5UERSDDLLN21DWLNUERRD1RSDWLNNNUEEERSSDWWDSREUNNLLD&G=subway&A=BoredMatt&D=18/05/2021&N=1&T=Untitled

//#### @Karoo
//W=7x7&L=p49s21p8p30p29s43p51s5p24p25p2p1p24p1p1s40&G=subway&A=Karoo&D=14/05/2021&N=1&T=Phil_Swift

//#### @PinkHoodie
// W=5x5&L=p11p4p4p14p2p2p20p3p2s1s3p14p2p16p2p2s13p3p2p2p16p2p2p3p15p5p18p2p2s3s27&SSE=26UNLWDSSREUUUNLLWWDDSREE&G=subway&A=PinkHoodie&D=2024-05-23&F=2&O=Quarter_Parks&T=Quiac&O=17/26

### ´´turning´´
V=turning

The loop must turn at turning rings.

W=9x9&L=z6z8z1z6z1z1z2z6z1z2z9z1z2z2z2z2z1z2z2z1z1z2z1z3&L-RING=T83T12&L-V=s21s14s6s1s1s1s27s3s1s12&SSE=26LWDSDSSRERSREUNUEUNNLLLLNLWDDSDWDDSREEEUNUERSDDDWLNNUUNUERRRRRSDWDSDWWWLNNUEEUNLW&G=subway&V=turning&A=BoredMatt&D=2021-06-10&F=4&N=2&T=Drunk-ball-boy-s-walk


Acknowledgements and changes
#=#=#=#=#=#=#=#=#=#

**2021-06-03** In no special order, thanks to @TophWells, @hempuli, @Zach, @Aspeon, @tann, @Deusovi, @JoelFox, @IHNN, @dohz, @MecHR17, @Pancelor, @Menderbug, @shark, @TJCGames, @skymoo, @tann and @JackLance for feedback, suggestions and/or trying some/many of the puzzles!
**2021-06-10** Special thanks to @CoreyHardt, @Karoo,  @BoredMatt for making nice puzzles with the editor, and for doubling down on the quarter-park variant & feedback/suggestions.
**2021-07-09** [Subway] diagonal mid-stations were added.
**2024-05-16** Turning triangles removed from base genre; replaced by the turning mark from ´´turning´´ variant
**2024-05-24** @PinkHoodie included this genre in a [puzzle series themed after the 26 letters of the alphabet|../puzzletters/2024-05-24]!