I was going to mention The Adventures of Batman & Robin on the Genesis, as the pseudo 3D presented in just the first level alone felt like a next generation thing that shouldn’t work. I’ll post the one fight that still impresses me to this day with the Mad Hatter battle.
Not only is it 3D looking, but also Mad Hatter’s face projected on the tiled floor looks great and moves around, and the warping of the platform as the black hole begins moving around in the background is just ridiculous.
Staying on the Genesis, Toy Story’s claw machine is pretty impressive for being just the Genesis hardware, and not 32X or anything else attached to it to pull it off, despite not really having much else to do other than picking up aliens.
I was also really impressed with Geograph Seal on the Sharp X68000
Though not necessarily as “impossible” feeling as the previous two, being on a straight up computer, it’s still something I don’t see much of game-wise on the hardware. It also runs really smooth and feels just like Exact’s early idea for Jumping Flash!