People who solve puzzles just for fun often reduce the amount of free-time they spend doing the puzzles if they are paid for puzzle-solving. This is known as the

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The overjustification effect refers to the idea that offering external rewards, such as money, for a task that someone already enjoys doing, can decrease their intrinsic motivation for the task. In the case of puzzle-solving, people may solve puzzles less often or for less time if they are getting paid for it compared to when they are doing it solely for the pleasure of the activity. The Premack principle refers to using a preferred activity as a reward for a less-preferred activity, the availability heuristic is a cognitive bias related to judging the likelihood of events based on how easily examples come to mind, and the opponent-process theory is a psychological theory related to emotional experiences.

People Who Solve Puzzles Just for Fun Often Reduce the Amount