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Wind waker interest curve

Interest curve for The Legend of Zelda: the Wind Waker; Bradley C. Buchanan

An interest curve is a graphical representation of a player's interest in a game over time. 

In chapter 14 of his book The Art of Game Design: A Book of Lenses, game designer Jesse Schell explains the importance of keeping a player's interest by paying attention to pacing, and making sure the action escalates into a climax at the end of the game. Interest curves may also be drawn for individual levels or challenges within a game, and ought to follow the same escalating structure.