Posted April 13, 2014
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I found this out a few weeks back as GFWL told me there was a patch while I was playing BulletStorm. And when GFWL does that, it signs you out of your online account until after you patch. And all during that time BulletStorm remained playable. I then further tested this by disabling my internet with Comodo's block all function.
I then fired up BulletStorm while offline and after an extended wait (obviously the time out period for not reaching GFWL) it loaded up and was playable just fine.