The Milton Bradley memory game was first created in 1966. In Australia, the game was made by the John Sands company and in Germany Otto Maier Verlag, Ravensburg, W. Germany. The UK had the game made by Waddingtons.
The game was intended for kids age 10 to adult, and could involve any number of players, though I expect if there were more than 6 it could potentially get a bit boring.
Original copies of this game are highly coveted and I’m lucky to own one that has the complete set of 108 cards. It’s in good used condition, but that’s as it should be for a game that has been so well-loved by so many people.