Can your steam-powered inventions save the ancient Library of Alexandria? Will you sacrifice the library to protect the city? Or will you protect the future king Ptolemy IV instead? “Choice of Alexandria” is an interactive novella by Kevin Gold, author of “Choice of Robots.” Your choices control the story. It’s entirely text-based–90,000 words, without graphics or sound effects–and fueled by the vast, unstoppable power of your imagination. The year is 245 BCE; you’re a heroic polymath librarian, invited to Alexandria to tutor prince Ptolemy IV. Coach the prince in…