Alec at Open Thinking & Digital Pedagogy for the find. Just imagine doing one of these with your students. It would be great. They could all take a branch of the story. Maybe the class could determine a few endings and set a goal to reach those endings within a number of steps (depending on the scope of the project). This could be a sizable undertaking, but one that could be a LOT of fun. I have flashbacks of high school when students would do projects for variety shows and pep rallies. Some of these included pre-recorded video that students, teachers, administrators, and members of the public participated in. They were great. Take this to another level and take the adventures through multiple threads. Incredible potential here for a fun, educational activity. Check out the start here and wait until the end to make your choice.