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It at the very least involves open-world, towns, NPCs, quests, dungeons, battles, XP and level up.

RPG Maker horror games involve none of these because they are not actually RPGs, it is merely the name of the software used to make them: RPG Maker, which was originally designed to make RPGs but has been used to make other kinds of games unrelated to RPGs such as horror games such as Ib, The Witch's House, Misao, Mad Father, the Strange Men's series, Aria's Story, Pocket Mirror, et caetera.