Thank you! However, I don't know where the Master Key went in this building because I've lapped the mansion countless times and could never find where it is hidden. Is it still in one of the nurseries, or has the location for the key been moved since then?
Would it require you to find the common key to open that door? Unless it is hidden somewhere obvious and I'm just incredibly blind, but I don't exactly know where the common key is hidden.
Sorry if I am asking a lot of questions, but I am not sure if I am missing something obvious during my playthrough
Seek out the bunny. 
I was a bit too evil with this one as it's VERY easy to overlook even with the ginny note stating a key was hidden in this room. I might move it and I am going to give offer a 2nd placement for the key since it's far too early of a stop gap for players.
You aren't the first. There is very poor lighting there and you can easily miss it even with the cursor hint. I am going to add a sparkle effect to the keys like the lantern has.
