The phrase "official guidebook" refers to a book that has been authorized or endorsed by an authoritative source or organization to provide information and guidance on a specific topic or subject. Full definition
Anyone who has contributed an amount lower than $ 25 will have the opportunity to increase their pledge to $ 25 or higher and receive The Tale of ALLTYNEX Official Guidebook as well as any other items that apply to the upgraded pledge amount. (kickstarter.com)
- both due out May 11th - «Perfect Guide» from Kadokawa featuring 496 pages covering all 900 Koroks, 385 Hyrule Compendium, 120 Shrines, 76 Side Quests, 15 Sheikah Towers and more - «Nintendo Official Guidebook» from Shogakukan featuring 352 pages and including an extra large folding map - both are priced ¥ 1,620 ($ 15) (gonintendo.com)
This delightful interview from 1990 with the Super Mario World development team was originally featured in the SMW official guidebook. (shmuplations.com)