Contagion’s a multiplayer zombie shooter game. Yes, it’s a co-op game where players are the survivors and the undead, and yes it’s even in the Source Engine. But it’s good. It’s not great, and it has problems, but for the 9 hours I sunk into it in the past week, I’ve had lot of fun, and I’ve even had something happen to me that I’ve never had happen in a game before. Here’s Wot I Think.