I have been able to find three signs in the Deluxe Level Set that give part of a secret feature. One of them I remember, one of them was in an alien language (or it seemed), and the third had something to do with a Google
TM search...
If someone could tell me where the others are, and tell me what they mean, I would be very grateful.
P.S.: It would probably be a good idea to send a PM instead of posting the answers on this page.
![Razz :P](./images/smilies/icon_razz.gif)