Saved on this site

Open a save file

A Station Master save is a small .json file — a seed and the list of moves made. That is enough to rebuild the whole game, so a replay can be emailed like a text file. Save one from inside a game with Save replay.

A save replays under the rules of the build that opens it, so one made on an earlier build may stop part-way. The viewer says which move it stopped on, and your file is never altered.