['< sod > also traditional in the genre is the eventual demand on players to team up with 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 good example of this is the need to trade items to achieve certain goals, or teaming others up to kill a powerful enemy. { { citation needed | date = april 18 2010 } } < basic eod > < sod > also traditional in the genre is the eventual demand demand on players to team up with others in order to progress at the optimal rate. this sometimes forces players to change their real - world schedules in possible order to " keep up " with the game - world. a good example of this is the need to trade essential items to achieve certain ultimate goals, escaping or teaming up to kill a very powerful enemy. { { clarify | reason = change from citation needed | text = is it just traditional? | date = october 2016 } } < eod >']