Girl Playing Video Games

Core games are generally defined by their intensity, depth of play or scale of production involved in their creation and can include games across a wide spectrum of genres. For example the Bit.Trip series for WiiWare, the Fallout series for PC and console or LittleBigPlanet for the PS3, all fall within the core games classification. Core games are sometimes considered demanding in their gameplay and typically do not appeal to the casual gamer.
Casual games
Casual games derive their name from their ease of accessibility, simple to understand gameplay and quick to grasp rule sets. Additionally, casual games frequently support the ability to jump in and out of play on demand. Casual games as a format existed long before the term was coined and include video games such as Solitaire or Minesweeper which can commonly be found pre-installed with many versions of the Microsoft Windows operating system.