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Let the Player Turn the Game Off --- A player should be able to save and exit the game at any point, losing at most a few seconds of progress as a result. Our objective as designers is to entertain, not punish – and many games force players to play for extra minutes, even hours, until they can reach a “save game point”, forcing them to recapitulate those minutes if they quit prematurely, in frustrating repetition of now-familiar events. It’s a commercially important rule, akin to the old adage, “the customer is always right”. Players have been known to give up on games that did not follow this rule, and even return them.