Warcraft 3 and World of Warcraft both have a T rating.
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Warcraft
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Warcraft 2's expansion, Both Warcraft 3's and World of Warcraft
are all online play. warcraft 2 and 3 use battle.net, while World
of Warcraft is a paid subscription MMORPG
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Officially, Warcraft 3 (including the frozen throne expansion)
came before World of Warcraft. You can check out the whole Warcraft
timeline on the World of Warcraft website in the links section
below.
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No plans for a warcraft 4 have been announced. It has been
stated that World of Warcraft is technically their "warcraft 4"
because it has been ( and still is) continuing the storyline of the
warcraft universe.