You are a changeling! Shapeshift into the form of other people in order to kill everyone in the building. Arrow keys to move. Z is to shoot (but only police can shoot), X is to shapeshift into the nearest enemy, and to shapeshift them into you. Anyone who sees you shapeshift or shoot a gun will be alerted, but if you shapeshift into someone else, they'll think it was them. Kill everyone to win!