Player Killing

Player Killing is the act of killing other players in an online game. With each story the act holds different meanings and weight.

Sword Art Online
In SAO, the act of killing another player is equivalent to killing another person in real life since their brains would be fried. The most pronounced case of murderers was a PK guild called Laughing Coffin. Performing a crime such as stealing, hurting and killing green players would turn the «Color Cursor» orange. The killers in SAO are called as red players. However, if a person attacks anyone who already had a orange cursor, its own won't change, since the game interprets it as defending someone or protecting itself.

By completing a certain tedious quest, one is able to remove their orange status.

Some of the players in SAO refuse to believe that people actually die when their HP reaches zero hence they do not refrain from killing other people.

ALfheim Online
The act of killing was encouraged since it was territorial battles which resulted in obtaining items as well as other benefits such as territory and power. Most notable is the Salamander struggle against the Sylph which is brought up numerous times in Fairy Dance.

Gun Gale Online
Players are encouraged in killing others since the guns which were effective on monsters were not effective on humans, but live ammunition guns worked well so a seperation on gun choice determined play style.

Types

 * Portal PK - Sending players to dungeons way above their level to die.
 * Monster PK - Using neutral monsters to kill players.
 * Sleeping PK- manipulating a sleeping person into a duel by moving his/her hand and then killing them.