There are many ways we find fun in games, and I will talk about the others. But learning is the one I believe to be the most important.
Quotes by Raph Koster
While metaphors are fun to play with, players can basically ignore them. […] Games, by the very nature of what they teach, push towards this sort of understanding. Since they are about teaching underlying patterns, they train their players to ignore the fiction that wraps the patterns.