I think i enjoyed 8 so much just do the combat timing mechanics. if you could master the timing of a weapons and the guaranteed critical s.

oh god i forgot about that. LOVED that game.

Trying to figure out the perfect city layout in Dark Cloud 2(not sure if that one counts :)
Tetra Master, Blitzball, the whole game of Vagrant Story: Sidney's back and forth nature. Opening battle scene from FF8, man i could ramble on for a while.

There were so many nice little touches in both P3 and P4.