MMPORPG for education

  An MMPORPG (Massive Multiplayer Online Role Playing Game) for eduational use.
  A role playing game usually consists of doing something (hunting monsters, casting spells, etc...) in order to gain "experience points". With those "experience points", you are able to defeat bigger monsters, travel to distant places, etc...
  Well, how about the same thing, only, instead of killing monsters, you would have to figure out problems (quest-based). With each problem solved, you could get rewards such as money or XP, which you can use to purchase vehicles or equipment.