SDI on the Sega Master System is one of those weird, kinda janky shooters from the late '80s that somehow sticks with you. You're piloting a futuristic fighter, blasting enemy bases and dodging missiles that come at you from all angles. The controls feel a little stiff at first—like most Master System games—but once you get the hang of it, there's something satisfying about lining up shots on those tiny pixelated targets.

It’s got that classic arcade vibe where you just keep pushing forward, racking up points while trying not to get blown to bits. The music’s repetitive but weirdly catchy, and the enemy patterns start making sense after a few deaths. Not the deepest shooter out there, but if you’re into retro stuff, it’s a neat little time capsule.