Deduce a single railway from station A to station B. Row and column numbers count occupied squares; gold track clues stay fixed. No loops, crossings or stray rails. Fifteen uniquely solvable 4×4, 5×5 and 6×6 journeys, piece palette, keyboard controls, live clues, undo, assisted hints, local saves and a completion train. Source: https://github.com/chrisboyle/sgtpuzzles/blob/d1e10eb57dd80af4999e698a9ab31f546e9a0b9d/app/src/main/jni/tracks.c (MIT).

switchyard-tracks.skillsafe.ai

Run app here

PricingCompletely free

Security scanClean — skill and frontend scanned

Source chrisboyle/sgtpuzzles

Created2026-10-26

Updated2026-10-26

Every public app is built from a security-scanned skill and must pass a clean scan — skill and frontend — before it can be listed. Have a skill of your own? Turn it into an app — or read the step-by-step walkthrough.