Lineage Gaiden (WIN).

The Lineage series is one of the longer-running contenders in the MMORPG genre out of South Korea, but the series' gaiden (side-story) title -- while online -- apparently is not multiplayer in the same way as its parent series. Instead, Yun Jinyon and Che Yonhak (spellings approximate), series developers, have made a classic RPG set in the Lineage gameworld.

Lineage Gaiden - Another Chronicle of Lineage is intended to be a more casual gaming experience, according to the creators' interview on Dengeki. Citing inspiration from such series as Ultima, Wizardry, Ys, and Might and Magic the guys from NCsoft bring us a dungeon-crawling experience set on a boardgame-like level map, with traditional turn-based combat. From what can be seen of the game, about the only inter-player interaction to be had lies in a challenge arena that logs and ranks scores from around the world.   

The game's main site is up, but the game itself is under maintenance until May 25th. It's free to register and play, if you can figure out the sign-up system. I have yet to figure out just what I'm doing wrong, that it won't let me finish the process.