Thanks a lot Latent Malice!
You're right with the clue for door with circles. I noticed no area was activate with cursor and I didn't go any further. But it's correct in this way to solve it.
I do not know if write here spoilers, but warning from here if you haven't played the game...
Now I am with 20 points, after forest walked, located Mugsey, his suitcase and a cabin...
Maybe it's a good idea that walkthrough... jejeje!