Zero Tolerance is one of those weird little Genesis gems that somehow pulled off a first-person shooter when nobody thought the console could handle it. You're part of a five-man squad dropped onto a space station overrun by aliens—think Aliens but with chunky pixelated corridors and flickery sprites. The controls take a second to get used to (no twin-stick aiming here), but once you adjust, it’s surprisingly tense creeping through dimly lit halls, never quite sure what’s around the next corner.

What’s cool is you can switch between squad members on the fly—each has different stats, so if your heavy weapons guy goes down, you’re suddenly stuck with the medic’s pea shooter. And yeah, the graphics are rough by today’s standards, but back then? Blew my mind that this ran on a Genesis at all. Just watch out for the elevator music—somehow that’s the creepiest part.