As a reward you will get the brown snake ingredient - throw it into the cauldron.
In the front on the left you will find some bricks which can be used to build a cabinet.
Take out the Spectrespecs and find invisible bricks on the right side.
Build a cabinet and open it.
Pieces of wood and lumber will fall out - throw then into the fireplace nearby.
This way you will get the last ingredient.
Go back a little and pick up the Spectrespecs.
Return to the place where the ghost has made a turn and build a staircase from some bricks.
You will get to the red wall.
Destroy it, and assemble a bell from the available bricks.
Hit it and another staircase will appear.
On the next level you find the Weasley’s chest - switch to Ron and open it.
There will be fireworks inside - fire them up!
They will build more stairs.
Now it’s enough to pull the rope and get into Professor Dumbledore’s office.
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