Secrets in BP???

[ROT51]

Hello everyone!

Black Plague is just awesome. But when i ended the game, i saw this text: you found all the artifacts and notes and unlocked some secret. So.. i think there is still some treasures or special places. I've finished the game about 6 times, and still i coudn't find anything unusual, except some batteries more, and same locked doors what i can't get open. So is there some secret rooms more.

Just answer YES or NO. No need for details so i might keep searching.

Sorry. I have bad english, but i hope you understand me