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Metal Gear (the series existed before 1998!) was integral in the creation of stealth gameplay as we know it. Not counting Metal Gear, MGS helped push stealth into 3D gaming and expanded the role of storytelling in action games. Halo introduced the regenerating shield/health system and helped popularize coop gameplay. My vote goes with Metal Gear Solid being more influential considering that its effects can be seen in action games outside the FPS/TPS genres.