I just read a quote from Charles Cecil the former development manager at Activision from that time.
It comes from the recent issue of Retro Gamer (load 219).
Prior to this quote he talks about the lead up to the Ghostbusters 2 film in 1989 and their work on the 2nd game.
"The previous Ghostbusters game, from 1984, had sold more than two million copies and had become the best selling game of all time - a title it still held five years later."
So would this be correct that it was the best selling game of all time until 1989.
I'm sure there's someone far better at looking up this kind of thing than me but I thought it would be nice to post this here as information from print magazines rarely reach internet forums these days unless someone big on twitter posts about it.
Now it could be that they were talking about it being the best selling UK video game, as Charles Cecil worked at the UK division of Activision. Alas, all we have is a little quote.
UPDATE: It was the best selling game of all time in the UK between 1984 and 1989.Last edited by Soren0079 - on 11 April 2021