It is a form of narrative modern and hyperlinked, every step further will take you on a different journey. It is fast literature: you can enjoy a story in less than one minute.
What will your story be about? Will it be a love story? A sci-fi? Or a murderous horror one? You get to decide how the story will take shape and how it will end. Simply click "Take me to a beginning" and you will be given the beginning of a story with two options about how to continue it.
Then just choose the one you prefer and keep going like this until you run out of options.
At that point, you have 20 words to write a finale.