['< sod > also traditional in the genre it is therefore the eventual demand on players to team up with others in order to progress at the optimal rate. this sometimes again forces players not to change their real - world schedules in order to " keep up " even with the 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 } } < eod > < sod > also traditional in the genre is the eventual increased demand on players to team up with three others in order to progress at the optimal rate. this sometimes forces players to change their real - world schedules in order to " keep up " with the game - world. a further good example of this is the need to trade items items to achieve certain goals, or teaming up to kill a potentially powerful enemy. { { clarify | reason = change from citation needed | text = is it traditional? | date = october 2016 } } < eod >']