This is a story, and hint book based on the video game "Shadowgate" for the Nintendo Entertainment System {NES}. It tells the story of a boy named Jairen, that predates the events of the video game. He must train and eventually defeat the evil king of castle Shadowgate. The book was written by Ellen Miles, the book is credited as being "Created by F.X. Nine", a production name created by Seth Godin. At the end of many of the books chapters there are hint about playing the video game. The earliest editions of the book did not have a "Trading Card", but later editions included a insert page, with a perforated trading card that could be removed from the book. In total 10 books were released in the "Worlds of Power", book series, each based on a NES game. The final page of the first edition of the book has a "Worlds of Power, Givaway", where there reader could win a Game Boy, or a game carrying case. The book is based on the ICOM video game of the same name. The game's story line, and characters were created by David R. Marsh, and Karl A. Roelofs.

Worlds of Power:
* #1 Blaster Master {ISBN: 059043778X} Written by A.L. Singer.
* #2 Metal Gear {ISBN: 0590437771} Written by Alexander Forest.
* #3 Ninja Gaiden {ISBN: 0590437763} Written by A.L. Singer.
* #4 Castlevania II: Simon's Quest {ISBN: 0590437755} Written by Christopher Howell.
* #5 Wizards and Warrors {ISBN: 0590437690} Written by Ellen Miles.
* #6 Bionic Commando {ISBN: 0590443151} Written by J.B. Stamper.
* #7 Infiltrator {ISBN: 0590443143} Written by A.L. Singer.
* #8 Before Shadowgate {ISBN: 0590443135} Written by Ellen Miles.

Junior Worlds of Power:
* #9 Mega Man 2 {ISBN: 0590437720} Written by Ellen Miles.
* #10 Bases Loaded II {ISBN: 0590443127} Written by A.L. Singer.