Greatest IP debut games (and why)

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I'd also give nods to:

Dead Space, for nailing its atmospheric depiction of sci-fi horror with its unique dismemberment-driven combat.

Halo: Combat Evolved, for revolutionizing the FPS genre to the point where it still feels relatively modern more than 20 years on.

Xenoblade Chronicles, for its unforgettable world, charming characters, and sublime soundtrack.