Yep, it's one of the first custom campaigns made for L4D2, now slightly extended, which is nice, the map was pretty underwhelming to begin with (unsurprisingly) so this doesn't make it much better, but hey, now it has a gauntlet ending, and I believe there's more props, so either added or repaired. It's a 1 chapter long campaign which can be beat in under 10 minutes, so you're not missing out on much, still a cool bit of history.
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This review was posted before the latest release.