What should I do. It expired today 3/31/2013.
Welcome to the PlayStation Community.
When did you purchase the game?
As for the code being expired, I'm not sure there's much you can do, you could contact the game developers/makers.
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We just noticed we have the same issue, but I found this link on another thread... looks like its been extended until March 2014! we havent tried it out yet though!