Dedalus is an authoring system for generating Choose Your Own Adventure (CYOA) narrative. It is similar to other creation tools like 
Twine, 
Undum or Varytale.
Games created with Dedalus can run in the browser, so they are very easy to deliver to potential players.
The sample game can no longer be played. It was an implementation of Cloak of Darkess, a very simple story meant just to showcase how different authoring systems implement the same game. Mind that the original Cloak of Darkess is thought for Interactive Fiction (IF), while Dedalus generates CYOAs, a different, but related, kind of interactive narrative. You can read the source code of Cloak of Darkess in the example directory.
You may want to read about the tecnical details or just keep reading the tutorial and start creating amazing adventures!
Note: The tutorial illustrates how to write Dedalus stories in the most "canonical" way, but there an alternative syntax for writig Dedalus narrative called Dedlee. It doesn't make use of HTML-like syntax, and you might prefer it. However, you should really follow the tutorial closely, it is short, easy and fun, and then have a look at Dedlee and decide what system you prefer.
