if the remaining chapters of deltarune continue the pattern that previously-locked rooms are the settings for new dark worlds, i hypothesize that we'll get to see worlds in toriel's room, the mayor's office, and the church
@Paravellex I mean to be fair is it a pattern if it's only happened once
the ominous doors south of the town will be the gateway to the final dark world, which will be based off the underground from undertale