The "Eternal Darkness: Prima's Official Strategy Guide" is a comprehensive guide for the video game "Eternal Darkness: Sanity's Requiem." Published by Random House Information Group in 2002, this trade paperback book features 160 pages of tips, tricks, and strategies to help players navigate through the game effectively. Written by Bryan Stratton and the Prima Temp Authors Staff, the guide includes illustrations and is geared towards a general audience interested in video games. This book is a valuable resource for gamers looking to master the challenges presented in the game.