In a series of experiments in which video games were matched on competitiveness, difficulty, and pace of action, researchers found video game violence alone did not elevate aggressive behavior.

此假设曾引起一系列的实验，实验通过匹配视频游戏的竞争性、困难度、动作幅度来验证单单视频游戏是不能引起侵犯行为的。

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Many online games will even temporarily tweak the difficulty of a quest, so that a player showing signs of becoming frustrated or bored is encouraged not to bail out of the game for good.

许多在线游戏甚至会暂时调整探索难度，使得表现出挫败和厌烦迹象的游戏者得到鼓舞，以免他们永久放弃此游戏。

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Currently, the FreeRice game has fifty-five levels of difficulty.

目前，FreeRice的单词游戏根据难度分成五十五级。

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Jackie Robinson had difficulty on and off the baseball field, but he did not let that interfere with his game.

VOA: special.2009.04.05

This adds another tier of difficulty to the game, as you have to carefully manage each fighter's life bar.

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If life in these United States were a role playing game, the lowest difficulty setting would probably be a straight white male who is one standard deviation above mean height. (Unless you are a good enough athlete to get into the NBA being much taller than that is not so good) Tall people have never been denied the right to vote.

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This game is all about tension, and the intense difficulty delivers it.

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