LogFAQs > #965826152

For example, in Fire Emblem, the Sacred Stones is commonly referred to as FE8, even though that's not an official title. Rather, FE8 is a fan given name because the game's perceived as the 8th game in the series (although ironically, the fan numbering is different from the "official" ordering). But if you start talking about Zelda6, nobody knows what you are talking about, even though by the same metric it should be Majora's Mask.

What other game series with at least multiple unnumbered entries have these sort of commonly accepted unofficial fan numberings? Star Ocean is the first that comes to mind, although it is officially numbered in the Japanese version.