In this free update, you can unlock F.M city right after completing the game's final stage, Utopia Shelter.
After that, all other new stages are unlocked linearly.
All Spark TEJ 2 Stages are now available in Spark TEJ 3!
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 9311279 · v1.0 branch
Steam updated · First observed