Yes another free MMO from Korea. Only this time it's an FPS where you buy guns to be better than other players. Coming real soon to the US.
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The generalization that you can pay cash to have an advantage is pretty much nonexistent -- the weapons are well balanced and even the best ones are available for in-game money.
Even if you're a diehard MW2 player or whatever, A.V.A is basically a must-play since you don't have to pay for it.