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I like the official online games. Like World of Warcraft, which I've never played, but it does look good.  I also like Maplestory, it's like an official online game, but it's free. |
If you like well made online games without having to pay fees, then you should definately check out Kal Online, Silkroad Online, or Knight Online. It's all free (unless you want to buy special in game items for your character, that takes real money).There can be very bad lags, however.