It's because they're numbered in the titles, just in Japanese. The Anime ones and the US version don't have numbers. You just set them in the chronological order they're released. We say AC for the arcade games, and CS for the console versions, but really, that's technically incorrect since the CS versions don't closely follow the AC numbered releases. Heck, Nanadaime (CS7) has songs from AC 9 and 10.
Like I said, you numbered them by chronological releases, not the actual number of the games themselves. |