Q: Infection, what's that?
Infection is this really great gametype, inspired by a custom game devised by our community in Halo 2, which we added official support for in Halo 3. In Infection, most players start off on a Human team, with one or more players starting off as Zombies. The odds are stacked heavily against the Zombies at first, but when a Human is killed by a Zombie (as they inevitably are), they join the Zombie team and turn on their former teammates.
Q: How long will the Living Dead haunt matchmaking?
Just for Halloween, from 12:01am to 3:00am the next morning, PST. We decided to let it go a bit late into the morning to give people a chance to play when they got home from their Halloween carousing. Infection is a lot of fun when everyone is into it, but we don't think it would make a good playlist long term, so it's going to come and go.
And if everyone has a good time, who knows? It may return, as the restless dead are known to do.