" Some hold the position that education is serious, but games are not; therefore games have no place in education. But an examination of our educational system shows that it is a game! Students (players) are given a series of assignments (goals) that must be handed in (accomplished) by certain due dates (time limits). They receive grades (scores) as feedback repeatedly as assignments (challenges) get harder and harder, until the end of the course when they are faced with a final exam (boss monster), which they can only pass (defeat) if they have mastered all the skills in the course (game). Students (players) who perform particularly well are listed on the honor roll (leader board). "

― , The Art of Game Design: A Book of Lenses