how do you unlock the Cellar by your house?

[golden tulip]

I saw that with the new update that came out that the Cellar is now accessible but I can’t figure out how to access it.

[main anchor]

You’ll get the key when you hit rank A

[golden tulip]

Ah ok. Thank you.

[cobalt sail]

building off of this question, how do you unlock the other parts of the cellar? so far i just have the first landing, and I really want to use the rest lol