What Gaming Series Has Continuously Improved For Multiple Generations?

[MontanaHatchet]

KingdomHeartsFan said:

VGhippy said:
If we can pick a series that only went from the PS1-PS2 then I have to say the mainline Ape Escape series. I loved 2 so much, I couldn't believe that 3 was even better.

I remember I played one of them on my cousin's PS1 when I was a kid, I loved it.  I should really track down some of the Ape Escape games.

I caught a goldfish and named him Spectre after the villain from the first Ape Escape game.

Not sure if that's relevant but it reminded me of that.