Zombie Apocalypse

This one will be quite challenging. You need to stay alive for 7 days straight. Start over to Day 1 and start from there. When a zombie grabs hold of you, push in L3 and shake it a bit to get the zombie off of you. It shouldn't be too much trouble till you get to Day 7. Here is where the construction workers are introduced. Also, make sure you save as many uninfected as you can, since they're grasp you can't shake off.

NOTE: Multiplayer makes it a lot easier to stay alive.

Optional Way: See 'Hotter Than Hell'.