Ewwwww!!Great game,though
Yucks!Dead people lying all around the place.The game rocks though.
Tip:
Walk to a wall.
make sure to get as close as possible to it.
Look in a slanted way.(i hope u understand this part)
Strafe to the end of the wall.
Look across the other side.Shoot while u strafe(or stop every 1 sec to shoot)
I hope u understand.That became a great help to me to complete the whole thing.