Ragnarok Online often referred to as RO, is a MMORPG created by GRAVITY Co., Ltd. based on the manhwa Ragnarok by Lee Myung-jin. It was first released in South Korea on 31 August 2001 for Microsoft Windows and has since been released in many other locales around the world. Much of the game's mythos is based on Norse mythology, but its style has been influenced by Christianity and Asian cultures. The game has spawned an animated series, Ragnarok the Animation, and a sequel game, Ragnarok Online 2: The Gate of the World.
Anyway, for those not sure as to exactly what the hell this game is, I'll state it simply: It's a more simplified Massive Multiplayer Online RPG with a semi-static world and and an equally simplistic graphical style. The graphics are beautiful in their own way. The game's world is rendered in full 3d with a nice amount of detail and some of the most well-done texturing I've ever seen, while the PCs and NPCs are 2d sprites much akin in looks to the ones from FFT.