Thanks for all the replies. It makes it a little easier to find what I am looking for. Although I am still wondering if SSD rather RPM makes much of a difference in adventure gaming. Does anyone know?
"RPM" means Revolutions per Minute.https://en.wikipedia.org/wiki/Rpm
"RPM" does not mean "mechanical drive" or "hard drive."https://en.wikipedia.org/wiki/Hard_disk_drive
If you ask for an "RPM drive" in a store, they will either look at you funny or send you to the automobile department.
With most games it won't matter if you use an SSD or a mechanical hard drive because RAM is more important.
However with the game "Obduction," an SSD was "strongly recommended" by the developer to reduce load times.
Considering the complaints about load times with the new reboot of "Black Mirror," there may be other games where an SSD will cut down on load times of games -- not just load time when you start the game, but when you move to different locations (or rooms) within the game.
SSD's are more expensive than mechanical hard drives for the capacity you get, but if you want to store large amounts of data you may want to use external storage anyway.