Modder Saul has whipped up a little plugin that allows you to play as the zombies in an online match (PC version only, of course). If you want to host a game, you download the plugin, if you just want to join a game, all you need to do is enter some commands in the console and you’re good to go.
Interested? Full details at the link below.
Play as Infected with the Left 4 Dead 2 Demo [L4dmods]
