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Subway

Updated on (created ) — Filed under: List Paper Ported Portponky Puzzle crossing diagonal loop monoline
Design a safe and green subway system, without sharp curves nor turns and crossing at stations. City parks are protected: no tracks may cross them.

Based on ruleset by Portponky & friends

First seen (2020) at Paper Puzzle Zone

Draw a loop through all stations.

The path may go straight or turn ±45 degrees.

Tracks may intersect only perpendicularly.

Parks may be touched but not crossed by the loop.

Tracks cannot turn or cross at a station.

Portponky composed the ruleset and first puzzles of Subway (2020), shared at Paper Puzzle Zone, , alongside many other original paper puzzles.

Pedro released the Subway interactive app, leveraging the Kudamono Editor system. Pedro derived the programming logic, decided on colours & input modes and created all graphic assets, by tracing SVG paths. Rule panels.

All puzzles listed on this page have a single, unique solution. Brand-new puzzles are proudly submitted by their authors regularly, while historic puzzles gain a new life in the interactive Kudamono format: here transcribed for the first time, with permission from each author, on a unit-, genre- or general basis.

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 by Yusuke Yamamoto — Puzzle Communication Nikoli vol.164 (2018-09) shares some similarities with Subway, albeit coincidental — thanks わんど (wand125)!

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

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These puzzles were made afterwards!

loading... puzzle11 loading... puzzle12 loading... puzzle13 loading... puzzle14 loading... puzzle15 loading... puzzle16

The loop must turn at turning rings.

loading... puzzle17

Start with a blank page (new Subway puzzle).

Detailed editing instructions and shortcuts can be found at the manual.

The following custom insertion shortcuts apply to Subway:

Keyboard shortcuts for Subway (S = solving, E = editing, S/E = both solving and editing )
Glyph When Submode Shortcut Description
www.w3.org/2000/svg'> S—-A → Uauto mode: auto-choose submode based on gesture type and location
www.w3.org/2000/svg'> SlineL → Iedge line with diagonals (solve): drag or click to draw definitive edge line with diagonals (solve)
www.w3.org/2000/svg'> EsymbolXAbsent tile: click or drag to place definitive symbol Absent tile
www.w3.org/2000/svg'> EsymbolZShaded tile given: click or drag to place definitive symbol Shaded tile given
www.w3.org/2000/svg'> EsymbolSStation vertex: click or drag to place definitive symbol Station vertex
www.w3.org/2000/svg'> S/Eaux markXdiagonal x: click or drag to place auxiliary diagonal x
www.w3.org/2000/svg'> S/Eaux lineS → Ksketch line (edge, octo): drag or click to sketch auxiliary line

Pressing an exclusive editing shortcut while solving, or vice-versa, causes a switch into that context. In contrast, shared shortcuts cause no switch, but are instead chosen to match the current context.

To copy the right url, simply follow the button sequence (export) → (link).

Likewise, a puzzle image may be exported via (export) → (picture).

Made a puzzle that you'd like to list here at Pedro's Works? Simply follow the Submission Guide!

When sharing a Subway link on other social networks or across the fediverse please also include the hastag #KudamonoEditor in the post. Including the puzzle picture will usually enhance your post.

On PuzzleSquareJP, if Subway is not yet registered, please register the genre there before posting. Please then for interlinking.

Please with any issues and suggestions.

There are specific instructions for live conflict highlighting and input issues, for improving the rule panels or reporting non-uniquenesses.

For any other bugs, please:

  • describe what you were trying to do,
  • what happened instead, and
  • send the current url (plus any visible error logs and possibly, supplementary screenshots).

You may check whether your bug is already covered by the unit tests (it may take a few seconds before the page loads fully). Any yellow boxes indicate a failed test. "Performance issues" currently indicate all passed tests, slow or not.

If you find a situation where the live conflict highlighter is not working as you'd expect (e.g. too aggressive, incorrect), please send a small test case url plus a brief explanation of what should be happening instead.

A good test case includes the smallest possible board, with the fewest possible elements, that is still able to unambiguously reproduce the issue.

For interface issues related input modes, or more generally to clicking/touching/dragging, keyboard shortcuts, etc… please submit an input test case, as detailed in the Inputs Initiative.

For simple typos/rewordings, a short email suffices. For more substantial changes, please refer to the rule panels guidelines.

If you find a non-uniqueness in one of the puzzles, please first check whether you are able to contact the puzzle author directly to request a fix.

If that seems impractical, please submit either:

  • a corrected, unique puzzle url (with solution), if you are able to suggest a fix (preferred); or
  • a puzzle url solved up to the point where the puzzle stops being unique; or
  • multiple urls (one per solution)
2021-06-03 In no special order, thanks to Cristopher Wells (Toph Wells), Arvi Teikari (Hempuli), Zachary Barbanell (TheZachMan), aspeon, tann, Deusovi, Joel Fox, Jeffrey Bardon (IHNN), dohz, Mechr17, Pancelor, Martin Ender (Menderbug), Shark, Tobias Cunningham (TJC Games), Skymoo, tann and Jack Lance for feedback, suggestions and/or trying some/many of the puzzles! 2021-06-10 Special thanks to Corey Hardt, Karoo, Matt (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!