A review of the game design literature reveals that among computer and video game developers there are numerous definitions. Examples include:
* "A series of interesting choices." - Sid Meiers
* The structures of player interaction with the game system and with other players in the game." - Patterns in Game Design (2005) Bjork, S. & Holopainen, J.
* "One or more causally linked series of challenges in a simulated environment." - Andrew Rollings and Ernest Adams on Game Design (2003) Rollings, A. & Adams, E.
* "A good game is one that you can win by doing the unexpected and making it work." - Game Architecture and Design (2000) Rollings, A. & Morris, D.