It’s been in development for a long time, probably because Heartbeat doesn’t exist anymore and ArtePiazza didn’t have another DS remake to act as a base for Dragon Quest VI: Realms of Reverie.
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One of Dragon Quest VI’s key features is it has two maps to explore, a real world and a dream world. New features, like extra dungeons which Artepiazza added to the other two DS remakes, haven’t been announced yet.