Ladder does not necessary mean "D2" ladder with resets, it means competitive ladderboard that display the top progressing players or players who like to compete with others
*Ladder can be about level race
*Ladder can be some sort of PvM points gain
*Ladder can be about MP10 monsters kills count
*Any other type of race or competition
You are NOT required to play on ladder, it is usually for those who like to play competitively/climb to the top.
Edited by Vanhyo, 19 February 2013 - 08:56 PM.