Player Versus Player (PvP)

This is a truly unique Mini-game. It involves direct competition between players in many different kinds of head-to-head contests, some very similar to GM events. there are contests where Monsters with the opposing player's name attack, and it must be defeated before the rival does the same. There are jump quests where the goal is to race to the finish, and contests where players fight to do the most damage to the same monster. The last contest is a pure killing fest, and whomever kills the most wins. To engage in PvP battles, a ticket needs to be purchased from the Cash Shop. Also, a player can only challenge someone who falls within 10 levels, either higher or lower, from their current level. a Win/Lose record is kept and posted on an in-game rankings board. The PvP system was originally exclusively linked to the Yuyuan Garden area of China, but can now be accessed from almost every town.

The PvP system is only available in ChinaMS, TaiwanMS and ThailandMS.
http://strategywiki.org/wiki/MapleStory/Quests/Mini-Games