Board Thread:General Discussion/@comment-66.85.227.68-20130716204920/@comment-24.102.223.172-20161029185537

You can use a plate to get under the front door (take two) drop the first one and run into it at face level, you should clip into the door and be stuck. Next take your second plate and drop it. Run into it again and you should fall below. Pick up your plates and walk to the left to pass an invisible wall, then head right, there should be an unlocked door.