"300" is a historical comic book adaption by Zack Snyder.
At first, you need to know that "300" is no 100 percent historically accurate movie to watch in a history lesson. "300" is based on the comic book by Frank Miller, writer of the popular graphic novel series "Sin City". So if you're With the help of many, many popular YouTube videos, it became a cult movie - in only a very short period of time. Phrases like "This is Sparta!" or "Tonight we dine in hell!" became widely known quotations, and the infamous scene, in which Leonidas kicks a messenger into a large pit became an often recreated and referenced scene. It has dazzling special effects, a story of a king who would rather die than surrender and a lot of symbolicism, that will go beyond younger viewers heads, but will leave more mature ones astonished. Okay, of course it is packed with much violence and over-the-top stereotypes, but some of the greatest films in movie history are as well. "300" is an instant classic that has very few things to complain about, but many to acclaim.
However, "300" is very brutal, there are three decapitations, you always see the stump and little blood. An arm is severed (blood spurts from the arm - you never see the stump). In the battle sequences people are slit with swords, impaled by spears, have limbs cut off, etc. Some of these acts are in slow motion and have extreme blood spurtings.
However, it is clearly visible that the blood is animated with CGI effects, and the violence is over-the-top.
There is one sex scene and a breast is visible, but the scene is dark and romantic, not pornographic and not meant to arouse.
The movie is suitable for viewers 15 and up for its violent content, that is strong but too over-the-top and choreographed to leave mature viewers disturbed.