Persephone's Mansion missing 12

pixel_player25732450

I have been through Persephone's Mansion at least 10 times now and have searched it in every possible way for hidden rooms and hidden tiles, but I still can not find the last 12 tiles.
I have even been through it with the available maps and still I can not find it.
Any help would be greatly appreciated.

Thank you in advance!

Yodalicious

pixel_player25732450 Hard to help. Red books are switches to open rooms a couple times.

pixel_player32951009

pixel_player25732450 On the far left side where there are 3 sets of stairs, go to the far left and click on the stone that is plain.

pixel_player25732450

Thank you for that.
Unfortunately I have been to every room that is shown on the maps as well double checked every book there is.

pixel_player13553352

12 boutons avec roses il faut regarder avec les yeux les miens sont bloqués pouvvez-vous m'aider merci!