I have Phantasy Star II, III, and IV on my PS2 game Sega Genesis Collection. I have played all three of them, but haven't finished any of them. The game doesn't feature the manuals of the games, and at the time I was playing them I didn't have Internet, so I didn't get comfortable enough with the battle systems. I still don't know what most of the spells actually do.

From what I played of those three, IV would be my favorite. I prefer the storyline of IV to the others, but III's story structure really intrigues me (though I have yet to complete the first generation's story). And my favorite character is Rudo from II. His back story touched my heart. I can't remember any events I like, but I do remember getting teary-eyed when the main girl from IV died. I think her name is Alys, but it may be a different spelling from the one that saved the world in the original Phantasy Star.

What brings me back to play the games is the fact that I haven't completed them yet.

I thought of getting Phantasy Star Universe, because it is said that it also has a one-player story mode as well as online play. I told myself to complete the Phantasy Star games I have now before getting any more. I mean, I have 14 Final Fantasy games, and I have only completed 8 of them.