The Phantasy Star series, with their online MMOs being the more recent iterations they have released, is another one of those successes; the first Phantasy Star Online is still being played in private servers to this day, and Phantasy Star Online 2 became one of the two most successful MMOs in Japan, the other being Final Fantasy XIV. Emphasis on in Japan because of its first attempt for a worldwide version failed spectacularly due to the mishandling of the game, with rampant pay-for-conveniences monetization method that plagued the game and pretty much every other free-to-play games at the time, something that isnt present in the original Japanese version. That said, in the past year, with the aid of Microsoft, PSO2 has gotten its global second wind and turns out that was just part of their plan to finally release.Phantasy Star Online 2: New Genesis! And its available for both Japan and the global audience, too!
Source: N4G PC Phantasy Star Online 2: New Genesis Impressions