Mu Online is a free-to-play MMORPG created by the South Korean company Webzen. The game, already popular in Asia, started in North America a few years ago, and it has proven to be very popular.
The main reason for this is that it is free, and also the game doesn't have high system requirements. From a simple point of view, the game takes a lot of elements on games like "Diablo", and even the view and inventory system is similar. However, the amount of zones in the game, in which you can interact with other players, is a big plus. When you start in the game you can see it is easy to learn and get into, however, sometimes you will end up killing the same monsters again and again in order to gain levels. When you gain levels, you can distribute character points among stats, which help in strength, agility and so on. The quests in the game are simple and sometimes they are not much of a challenge. In all, the game is pretty solid and it is easy to see why it is so popular. It may fall back against other games, but hey, its free!
Good server.