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X-COM: UFO Defense is the granddaddy of tactical strategy, the game that made countless players paranoid about what might be lurking just outside radar range. It blends base management, research, and brutal turn-based combat into something endlessly compelling. The tension of opening a UFO door never really goes away, even after dozens of missions. Soldiers are fragile, aliens are terrifying, and success is never guaranteed. It is the kind of game that creates stories on its own, usually involving heroic last stands or catastrophic blunders. Even today, it remains a masterclass in how to make strategy feel personal and terrifying at the same time.