Haha Esuohlim,
Those children's sound books were pretty cool, but only the Batman and TMNT ones. The rest were useless. Anyways, I wouldn't consider those choice-based, becuase there are no real choices. Although, the reader does get to press those sound buttons out of order and make repeated BOING! sounds (really, and they say its for kids).
When I say choice-based interactive books I mean the "Choose Your Own Adventure", "Which Way Books", "Endless Quest", "Time Machine", "Goosebumps", etc.
In these books, the reader gets to make choices, and if they make a wrong choice, they could be shot (or in the case of "Ariona", they could be decapitated). Most of them have alternative endings, some where the main character wins a million dollars, others where they merely survive the chaos.
But I bet you already know this
And Fathom Zero,
"Ariona" is selling well. In fact, the sales are expected to double over the next couple of months.