The last think you could remeber was you sat in school, bored. You looked out of the window and saw a really tall building from afar.

Then everything went black. You open your eyes to find out you are on top of a really high building, thousands of feet above the ground. Each building was connected by a wooden bridge.

This is was a place where some people would walk around in masks. They were put to kill the people. If you saw a mask..

Kill them.