concerning the very first puzzle with the 4 levers:
just scope 2 rooms down. the answer should be obvious there.
for the next rooms: always check the map in the top left after every change.
2 of the rooms actually work together in a certain way.
did you realize that the eye symbol was the one flashing in the beginning of the game?
and which room did react when you pulled the levers?
so I wonder what happens if another rooms symbol is flashing instead...
and you used the levers...
and always keep track of where everything is via the map on the top left.