The Drunken Lizard Pub

Some rock disappears (so yeah 'a door opens'). What you flip is not important, the final configuration is what matters.

thanks - of course as soon as I posted my question I went back to give it one more try and this time it worked. Always got to be smarter than the equipment you operate!!

As ...

There is nothing through there needed to finish the game.

There is an opening which appears leading off to the South, to a cave of treasure. You can probably see some of it in the map even if you can't get to it.
Not sure what you are doing wrong .. nobody else (as far as I know) has failed to ...