What about Final Fantasy or The Elder Scrolls? They remain faithful to the 'number-rule'.
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Elder Scrolls Online.
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Especially Final Fantasy.
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Let's not forget Dragon Quest
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Edited by die wily: 1/17/2013 7:15:51 PMTES makes the subtitle so big that the actual numbered title paradoxically becomes the subtitle, so it didn't cross my mind. FF is a loose collection of not-related fictional universes so it's more of an anthology than a series. Individual FF games have numbered sequels to them, so technically a FF series has never gone above 2.
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Don't forget Final Fantasy [i]Chronicles[/i].