-to have acces to the first floor repair the old
clock
-to get the triangle shape get
the bomb in the room on the left in the first
floor and use it against the cracked wall in the
first floor hallway, that will open a secret room
where you'll find both the triangle shape and
the ID card.
if you look closely at the green you'll notice
few white dots, you can use them as markers to aim
at the holes. some holes that look real tough will
get easier this way.