Gameplay and playability
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Introduction
Wikipedia defines "game play" or gameplay “as the specific way in which players interact with a game, and in particular with video games. Gameplay is the pattern defined through the game rules, connection between player and the game, challenges and overcoming them, plot and player's connection with it.” Gameplay, retrieved oct 3 2012.
Good game play increases so-called playability, that wikipedia defines as “a term in video gaming jargon that is used to describe the ease by which the game can be played, or the quantity or duration that a game can be played, in other words, the quality of gameplay.”
Gameplay and playability are part of the more complex "player experience", i.e. the user experience with a game which can be broken down to: usable, desirable (motivating), valuable (players will achieve something), etc.
Links
Wikipedia entries of interest