How do I get the bum to go away?

I got past the grating, but I can't see a thing!

I have NO idea which sequence to push to clear a path through the crates!

How do I drain the sewers?

All right, I'm in the sewers, but I can't get across.

I can't open the hole at the center of the sewer room.

I can't put the cylinder in the phonograph.