“An activity with rules. It is a form of play often but not always involving conflict, either with other players, with the game system itself, or with randomness/fate/luck. Most games have goals, but not all (for example, The Sims and SimCity). Most games have defined start and end points, but not all (for example, World of Warcraft and Dungeons & Dragons). Most games involve decision making on the part of the players, but not all (for example, Candy Land and Chutes and Ladders). A video game is a game (as defined above) that uses a digital video screen of some kind, in some way.”
Challenges For Game Designers