Here's the clincher, a peice of prior art that I found which is being released with the movie: Harry Potter Casting Stones
It does not use the same mechanism, but produces the same result, and has two names with which I cannot compete: Harry Potter and Mattel. Here is the official website: mattelgames.com/harrypotter
U.S. Patent & Tradmark Office search:
When viewing links below, click on the "" button to see a sketch.
Towel games
similar in that is portable game made of fabric.
Method and apparatus for a konane game
The invention relates to a new transportable konane game with a pouch that opens into a playable flat surface and new rules of play.