SDI

Developer: Sega

SDI is a brisk arcade-style shooter on the Sega Master System that blends defensive strategy with direct action. Players guide a targeting cursor to intercept incoming missiles and hostile craft while piloting a small attack ship between stages. Waves grow relentless and require quick reflexes, careful target prioritization, and tight control — the kind of classic difficulty that rewards practice. Its compact stages, pixel-era sound, and emphasis on protecting satellites give it a distinct Cold War arcade flavor. A short, challenging experience for fans of retro shooters who enjoy fast-paced, precision gameplay and high-score mastery.