The other dolls will without a doubt gather up in room 10 out of curiosity since it's close to room 12.

Then you can just pretend you're using room 12.

While I do my experiments in room 14.

The big gathering room.

The landmark.

The actual experiment room.

...But even if I get into room 12,

How are you planning on communicating with people outside if you're in there secretly?

Only I know you're in there.

In room 12 there should be a lamp and and a switch.

It's an old Morse code system, perfect to disguise as furniture.

When you're in the room you can contact me with that.