The OSR is a movement of nostalgia. Rather than seeking to actually emulate the way RPGs were played in the 1970s and 80s, the OSR is seeking to bottle the lightning of the first time you found a Player’s Handbook or Basic Set and just played, actual rules be damned. While the OSR as a movement is certainly informed by the cultural phenomenon of having the D&D red box show up in toy stores and in the hands of many kids and teens in the 1980s, the roleplaying hobby itself was already significantly more diverse than any one movement could capture. As an example, around the time that the OSR casts its rose-tinted glasses toward, there was a successful and long-lived game called Rolemaster.