@Guru_Larry apart from the other answer from Missingno, it's a useful term because of the differences between the two series. SotN introduced melee, magic, summons and RPG elements, which rounded out the genre in the wake of the already-introduced Metroid elements.
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Re: Who Created The Term "Metroidvania"? Gaming Historian Critical Kate Tries To Find Out
@Guru_Larry apart from the other answer from Missingno, it's a useful term because of the differences between the two series. SotN introduced melee, magic, summons and RPG elements, which rounded out the genre in the wake of the already-introduced Metroid elements.