In the dimly lit rooms of the '80s and '90s, young gamers would eagerly tear open the plastic wrap of a new video game, looking forward not only to the game itself but to the experience that accompanied it. Even before pressing the first button or playing the initial level, a ritual awaited: exploring the game's manual. These booklets were filled with art, lore, maps, and backstory, all of which helped get players immersed in the game and learn what was to come.
Source：https://www.cbr.com/video-game-manuals-history/
