![](http://web.archive.org./web/20100807160228im_/http://www.blogcdn.com/www.joystiq.com/media/2010/08/gibfestmutation.jpg)
Outside of mutations, versus and the co-op campaign actually both nab about 40 percent of players every day. And while Valve doesn't mention any of the least-played mutations, it does give notice to the Infected-doubling Hard Eight mutation, which was only tried by 26 percent of players but still grabbed over 10 percent of that week's playing time. This week, it's a "Gib Fest," with everyone on the team getting M60s and unlimited ammo. That sounds like a hunting accident just waiting to happen.