Techgage posted an article that talks about registering games you already own to EA's Origin gaming platform, along with a table of the titles we did or didn't have success with.

A little known fact about EA's Origin is that many games you've purchased elsewhere, either at retail or on Steam, can be registered and used through it. The problem: EA doesn't have a list of titles that support this. Until that happens, we've started our own, and welcome submissions to see it grow.

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