Meanwhile was published three years ago as a mammoth choose-your-own-adventure comic, but it began life in 2005 on Jason Shiga’s wall. The cartoonist (and mathematician) plotted all 3856 possible stories in an elaborate flow-chart so he could keep track of them while producing the book. And then, last November, in collaboration with text-adventure writer Andrew Plotkin, he released Meanwhile as an app. [T]he iPad seems like the perfect venue for this story, which serves up everyday choices — chocolate ice cream, or vanilla? — alongside more extraordinary ones. After using the (possibly mad) scientist’s bathroom in a rush, would you rather try out his time machine, his memory-reading device, or his… Killotron?