I recently collaborated on a Transmedia story for school! It's pretty cool, so I think you should check it out when you get some time. The amazon link to the left is the book we used as a textbook for this class.
Here's an excerpt:
“Besting the Beast” is an immersive, interactive, transmedia story based on Richard Connell’s “The Most Dangerous Game,” designed and produced by students of Full Sail University’s Creative Writing for Entertainment BFA program.