PCG-Based Game Design Patterns
  People enjoy encounters with generative software, but rarely are they encouraged to interact with, understand or engage with it. In this paper we define the term 'PCG-based game', and explain how this concept follows on from the idea of an AI-based game. We look at existing examples of games which foreground their AI, put forward a methodology for designing PCG-based games, describe some example case study designs for PCG-based games, and describe lessons learned during this process of sketching and developing ideas. 
Michael Cook, Mirjam Eladhari, Andy Nealen, Mike Treanor, Eddy   Boxerman, Alex Jaffe, Paul Sottosanti, Steve Swink
cs.AI cs.HC