Kill the nurses in this area, then pick up the 'First-Aid Kit' at the
Northeast corner of the hall. Try to go through the big double doors at the
Southwest end only to find a code is needed, this is the same code you found
in the Doctor's Lounge on the first floor, if you don't remember the code on
easy and normal is 7335, and 1328 on hard. There are tons of patient rooms
here, first of all start by going into room S3 for a scene. Afterwards
examine the desk to find the 'Roof Key.' Make your way to S11 and you'll find
a 'Health Drink' along with a save point. Once again backtrack to the stairs
and climb up to the roof. Use your key to go out onto the roof. At the upper
left corner you'll find a notebook, if you read it, it will have a small
effect on what ending you may get, keep that in mind. You don't have to read
it, just approach it and then run down to the fence in between the stairwell
and the Control Room, you'll hear a sound and then an unavoidable scene
involding the most evil of all creatures, Pyramid Head.
When you have control again you'll be in a room with four doors on the North
wall. Note that you actually take damage from that fall so make sure you
aren't in too much danger. Go into the third door on the left and examine the
bloody mess, make note of the numbers you see here. Sometimes they can be
hard to make out, and numbers like fives can actually sort of look like
different numbers, there's no way to know for sure since it's random, but do
your best. Leave this room and go back into the large Southwest double doors,
this time enter room S14. Approach the box and go into your inventory, use
the Lapis Eye key to remove the first of the four locks, then the Purple Bull
Key to remove the second. In your menu select the Memo option at the bottom,
and choose the "Imprint on carbon paper." Use this number seen here and punch
it into the button lock on the right side of the box. Finally go back to Memo
and check "Tern tern tern the numbers" and make note of this code. Input it
into the cylindrical lock (the numbers facing forward from top to bottom) and
the chest should now open up. You get 'Piece of Hair.'