Except for epistolary pieces, the form reminds me too much of this–
from The Guardian:
Want to choose your own adventure? There’s a books app for that
Childhood days of cheating on the Choose Your Own Adventure books by jumping back 10 pages after being eaten by a monster or falling down a chasm may be over, after the series was launched as an iTunes app last week.
The classic title Return to the Cave of Time – in which the reader can journey through the ages using “all of your numerous talents and much of your enormous intelligence to avoid disaster, even death” – was launched this week as an interactive reading experience for the iPhone, iPod Touch and iPad.