It’s really happening. The StarCraft II: Wings of Liberty campaign, ranked multiplayer ladder, and Co-Op Commanders will soon be available for everyone for free.
StarCraft II Is Going Free-to-Play
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Starcraft 2 Dev On The Effects Of Going Free-To-Play - GameSpot
StarCraft II: Free to Play Overview
StarCraft II Will Be Free to Play Starting Nov. 14
StarCraft II Free to Play: Legacy (Full Version)
Starcraft 2 Dev On The Effects Of Going Free-To-Play - GameSpot
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StarCraft 2 Will Be Free-To-Play Starting November 14th
StarCraft 2 Becomes Free-to-Play Starting November 14
How to get started with StarCraft 2 - Macro Tutorial - All Three
StarCraft II Official Game Site