Worlds of Power was a series of novelizations of NES games published in the early 1990s by Scholastic Books. They were written by several authors using the pen name "F.X. Nine". The books averaged about 120 pages long, and featured strategies for the featured game as an added incentive, either in a trading card on the inside cover or at the end of each chapter. At the end of each book was a list of recommendations for other books the author "thought you might like". The quality of the books varies, as does the faithfulness to the game's plot.