If you want 4, Jo, go get it.
I've never played it but it's a very different game from BS1, 2 and 5 (which is why I'm not interested).
Five goes back to the world of the first two games and 4 is not incorporated in it at all.
Talk about comparing apples and kumquats....
"Best not to think about it. I don't want to fall to bits 'cos of excess existential thought."