Does the Brave New Wonders Demo Save Carry Over?
The developer says demo and playtest saves carry into the full game.
Quick Answer
Yes. City From Naught said that saves from the demo and playtest carry into the full release. That is the published expectation, not a manual migration guide. If the full game does not show your progress, keep the original demo data and check for a current developer notice before moving or overwriting files.
On This Page
What the developer confirmed
The prelaunch Steam announcement explicitly said demo and playtest save files would carry over at launch. The announcement does not give a separate manual migration process for missing saves.
If progress is missing
First confirm that you launched the full release with the Steam account used for the demo or playtest. Check the game’s save selection and Steam sync status. Do not delete the demo or playtest install data until the expected progress is visible in the full game. We have not found an official, game-specific manual file-copy procedure to recommend.
Scope of this answer
This answer records the developer’s stated transfer policy. It does not diagnose an individual missing save, and it does not claim that every test build remains compatible after every later update.
Official source
City From Naught Steam announcements, including the launch reminder that demo and playtest progress carries over.