['< sod > also traditional in the genre is the eventual demand on players to team up up with others first in order to make progress at the optimal rate. this sometimes forces players to change their real - world schedules in order to " keep up " with the game - game world. a good example of this is the need to trade items to achieve certain goals, or teaming up to kill a powerful enemy. { { citation needed | date = april 2010 } } < regular eod > < sod > also traditional in the genre is the eventual demand on players willing to team up with others in order to progress at the optimal rate. this sometimes forces players to change their real - life world schedules in order to " actually keep up " with the game - world. a good common example of this is the need to trade items to achieve certain goals, or teaming up to kill a powerful enemy. { { clarify | reason = change from citation needed | text = is it traditional? | date = october 16th 2016 } } < eod >']