Brian Mayer 
Create Interactive Stories in Twine [PDF ebook] 

Interactive storytelling is the basis for any game, and Twine gives users the tools to make their own choose-your-own-path games. Starting with the basics of storytelling, moving to Parsely games, and finally exploring Twine, readers will learn the ins and outs of making fun and engaging story-based games. The hands-on activities in this remarkable resource are uniquely designed to teach readers the basics of computational thinking, variables, and the Harlowe programming language, all while having fun making a game online.