ah ah,
I found this kind of black hole in the center of the map rather strange ...
I turned, turned around, looking for the entrance, without any success.
But your last post, ISS, made me understand and ... reread what Rax wrote in a previous post. :
rax wrote: ↑Sat Nov 14, 2020 10:09 pm
Unlock all the chests and take the treasure from the dungeon:
Damned! To complete this map with the only missing screen ,
I will have to open the 40 chests ... Diabolic challenge!