The Caves and the Castle normal - Brief visit

[Freddy]

I didn't take the rugsack in account because it was left of the doors and so before any of the doors. But maybe I should have think a step further. Because there was nothing else, besides 2 critters, the backpack was the only lead.

Meanwhile I am a little bit further and I am happy (really?  ) with the close to game over feeling. See image 1.

More to the right in the mansion my Jack had a red key that he used (see map) at the right of the purple door.

The map shows me this:
1) a green key that I can't get and a green door;
2) a yellow key that I can't get and a yellow door;
3) a purple key that I can't get and a purple door;
4) two red keys that I can't get and two red doors.

So for all visible doors I see appropriate keys, but I can't get any. To continue I am surely missing something.