Heavy Unit - Mega Drive Special is one of those classic Sega Genesis shooters that flew under the radar—probably because it never left Japan. You pilot this chunky mech loaded with weapons, blasting through waves of enemies that get seriously aggressive by stage three. The power-up system’s a bit weird at first (why do some upgrades make your shots worse?), but once you figure out which weapons actually help, it’s got that satisfying "bullet hell but you’re the one dishing it out" vibe.

Graphically, it’s pure late-80s arcade port—big sprites, explosions everywhere, and that one boss who takes up half the screen. The music’s exactly what you’d expect: synthy, high-energy, and somehow always louder than it needs to be. If you’re into obscure shmups or just want to see what Sega was putting out before Thunder Force took over, it’s a solid time capsule. Just don’t expect a deep story—your mech’s entire motivation is "shoot the aliens."