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All the best games are easy to learn and difficult to master. They should reward the first quarter and the hundredth.
- Ian Bogost (April 2, 2009). "Persuasive Games: Familiarity, Habituation, and Catchiness". Gamasutra. Retrieved 26 February 2014.
- "Bushnell's Theorem: Easy to Learn, Difficult to Master". Wolfshead Online. Archived from the original on 26 February 2014. Retrieved 26 February 2014.
- Frank Cifaldi (March 11, 2010). "GDC: Blizzard's Core Game Design Concepts". Gamasutra. Retrieved 26 February 2014.