The 6-8 trilogy is what introduced me to it, so it’s one of those, but it shifts every time I replay them. Probably 7, but I played them back to back a few months ago and 6 does have the more expansive maps to explore.

4/5 are great too, for the classic grid style ones. I never touched 9, I heard it was pretty bad. I picked up 10 in a sale a while back, and it looks like a pretty good mix of the 4/5 and 6-8 styles (3d, but grid-based). I’ve been really preoccupied with some other long games since then though, so I haven’t tried that one too much.