zealous lichen
Many popular games release a Public test build before releasing big changes to the live servers to see how the community would react and to find game breaking bugs before the release.
I think secret neighbor should have that too because many people disagree with the recent changes and updates.
As for an example of how it would work, imagine they wanted to do a ghost rework rework and they make a PTB 1 week before the release so it doesn't come out extremely broken.
This would obviously be steam exclusive.
acoustic bolt