Raph Koster Quotes
Raph Koster (2013). “Theory of Fun for Game Design”, p.46, "O'Reilly Media, Inc."
Raph Koster (2013). “Theory of Fun for Game Design”, p.96, "O'Reilly Media, Inc."
Raph Koster (2013). “Theory of Fun for Game Design”, p.40, "O'Reilly Media, Inc."