Opens (unlocks) a new, hidden level titled: "the Door to A Mystic
Treasure." Start or continue a level. Click the "Menu" option on 
the right side of the game window. (Alternatively, open the Options
screen, from the main window.) Select the "Credits" option. Allow 
the list of creator names scroll to the end. A cube (block) will 
appear and scroll up from the bottom of the window. Drag and drop
the block on the shoulders of the worker that appears to be holding
an invisible block. 

The worker is located on the lower right side of the window. If 
the block is placed properly, a message will appear stating:
Victory! 

The door to a Mystic Treasure has been opened. A new LOST WONDER is
now available! Click ok to close, and play the new level. If a level
was in play when the above actions were followed, the level will 
continue after you complete or quit the unlocked level.