The Entertainment Software Rating Board (ESRB) was founded and started rating games in the year 1994. It is a self-regulatory organization that assigns age and content ratings and enforces industry-adopted advertising guidelines for computer and video games in the United States and Canada.
In addition to the letter-based rankings, official ESRB ratings include an appropriate Content descriptor of potentially objectionable content. Those associated with a M rating are:
Content descriptor
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Definition
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Animated Blood
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Discolored and/or unrealistic depictions of blood
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Blood
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Depictions of blood.
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Blood and Gore
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Depictions of blood and/or the mutilation of body parts.
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Crude Humor
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Depictions or dialogue involving vulgar antics, including "bathroom" humor.
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Drug Reference
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Reference to and/or images of illegal drugs.
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Intense Violence
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Graphic and realistic-looking depictions of physical conflict. May involve extreme and/or realistic blood, gore, weapons and depictions of human injury and death.
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Language
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Mild to moderate use of profanity.
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Lyrics
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Mild references to profanity, sexuality, violence, alcohol or drugs in music.
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Mature Humor
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Depictions or dialogue involving "adult" humor, including sexual references.
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Nudity
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Graphic and/or prolonged depictions of nudity.
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Partial Nudity
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Brief and/or mild depictions of nudity.
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Sexual Content
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Non-explicit depictions of sexual behavior, possibly including partial nudity.
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Sexual Themes
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References to sex or sexuality.
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Simulated Gambling
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Player(s) can gamble without betting or wagering real cash or currency.
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Strong Language
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Explicit and/or frequent use of profanity.
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Suggestive Themes
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Mild provocative references or materials.
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Strong Lyrics
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Explicit and/or frequent references to profanity, sexuality, violence, alcohol or drugs in music.
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Strong Sexual Content
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Explicit and/or frequent depictions of sexual behavior, possibly including nudity.
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Tobacco Reference
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References to and/or images of tobacco products.
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Use of Alcohol
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The consumption of alcoholic beverages.
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Use of Drugs
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The consumption or use of illegal drugs.
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Use of Tobacco
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The consumption of tobacco products.
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Violence
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Scenes involving aggressive conflict. May contain bloodless dismemberment.
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