http://en.wikipedia.org/wiki/Casual_gameA casual gamer is a type of video game player whose time or interest in playing games is limited compared with a hardcore gamer.
Casual gamers can conceivably consist of any people who show more than a passing interest in video games; therefore, it is difficult to categorize them as a group. For this reason, games which attempt to appeal to the casual player tend to strive for simple rules and ease of game play, the goal being to present a pick-up-and-play experience that people from almost any age group or skill level could enjoy.[6][24][25][26][27] Casual gaming demographics also vary greatly from those of traditional computer games, as the typical casual gamer is older and more predominantly female,[28][29] with over 74% of those purchasing casual games being women.[30]
Most casual games have similar basic features:
Extremely simple gameplay, like a puzzle game that can be played entirely using a one-button mouse or cellphone keypad
Allowing gameplay in short bursts, during work breaks or, in the case of portable and cell phone games, on public transportation
The ability to quickly reach a final stage,[5] or continuous play with no need to save the game
Some variant on a "try before you buy" business model or an advertising-based model
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