Fighting Fantasy, if anyone cares to remember, were a series of books where you would roll dice and flick through the pages depending on the outcome of fights and what you chose to do in the story: "there is a door, Do you open it? "(turn to page 227) or "Walk on by, down a dangerously gloomy corridor" (pg74)". That sort of thing. Deathtrap Dungeon (DD) is one of these books, only it's on the iPhone. So you have to squint more, but at least you don't have to turn any pages.