You don't actually
still play Zool do you?
I thought that was just a joke!
I tell you what there are only 2 older games that I do go back to consistantly and that's Sega Bass Fishing and Civ. I dunno if they count really though cos Civ is on my mobile so it's not really reto, it's the newer one, and Sega Bass Fishing is off the PSN store. I doubt I'd bother plugging everything in again.
I do play Rollercoaster Tycoon once in a blue moon though.