If you want to fight other players, but you don't want to have to deal with PK mode, the arena is a good place to go. In the Battle Arena, you can fight other players freely, and if you die, you don't lose items or experience points. The good thing about fighting in the Battle Arena is that you know that everyone there likes to fight, so unlike random player killing outside, you will not be killing people who don't want to fight.
The first Battle Arena you come across will be in Street 2, near the coordinates x:173, y: 83. This arena is restricted to players between level 1 and level 199. You will also find other arenas on different maps by exploring the game world.
