An activity that is voluntary and enjoyable, separate from the real world, uncertain, unproductive (in that the activity does not produce any goods of external value) and governed by rules.

The process of designing the content and rules of a game and design of gameplay, environment, storyline and characters in a game. 

The way players interact with a particular computer game. It is further characterized as the way the game is played, including the rules, the plot, the objectives and how to conquer them, as well as a player's overall experience.

A suite of visual development tools and reusable software components designed to support the creation and development of computer games. The core functionality provided by a game engine typically includes a rendering engine for 2D/3D graphics, a physics engine (collision detection), sound, animation, artificial intelligence and networking.

The use of computer and non-computer games, such as card and board games, to deliver, support, and enhance teaching, learning, assessment, and evaluation.