Green door just following purple door after first save

[Rickfal]

Since my last post, I played again. I had always found a green key in room 16106. When I got to room 15909 where the first green door is, I found a way to bypass the door and not use the key. So when I left the main building I had the green key that I didn't use. I am now at save 2. I started a new game and found the key in room 15707. Thanks for all your help. Yes it is a fun mansion!