Silverfish Dungeon

I don't know how the Silverfish dungeon works can you help me?

 

First room puzzle to the left is a jump puzzle at the end throw an item on the wooden pad then go to the room on the right swim up the snakes mouths and put emeralds in the center of them. The next important room is a parkour room (I usually take the far left path) after that you should come to a dangerous room run up the stairs and to the end and fall into the obvious trap. When you reach the bottom turn around and press the button then run out of the room through the door that the button opened. The last room is easy just walk up to the boss door and fight them.