How To Go In Unreleased Rooms

Today I found a glich on how you can go in upcoming rooms. Its the same thing as the music am glich on getting up the backstage. Anyways first go on the ladder and double click where the red circle is before you exit.

Then what will happen is that you will be on top of the room where there is a big door and lava

      Ok if you go in the door in your left you will appear in this room and you will be able to do mission 2

And if you go in the path on your right you will appear in herbert's lair and you can see that G is trapped inside some container.

Credit to my buddy Alessio85047 for telling me about the glich. So Do You Guys Like The Glich? Let Me Know in A Comment Below!
-Darkwolf0012