Winner:
Andrew Richardson - Australian Water Services
Who very kindly donated the $100 prize to Red Cross

Answer:
John found Effie in Room 7
You can download the solution to the quiz here in Adobe Abrobat format: | DOWNLOAD |

Brain Teaser Clue:

If a sign above a room contains two statements, only one statement needs to be false to define the sign as a false sign.

Good Luck!