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To clarify, any codes I did find claiming to make hard campaign available either I wasn't able to get them to work or they may have been fake, I can't independently confirm which.
There's two US versions of AW (1.0 and 1.1) and codes for one won't necessarily work with the other. That being said, most people don't know about it. Of course, check that you're not playing EU AW or Jp AW + AW2 either.
IIRC, all the codebreaker codes on the web are for the US 1.0 version.
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