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The ruins of an ancient Martian civilization have unlocked the secrets to teleportation, and the UAC will stop at nothing to harness this world-altering technology. As part of a marine detachment sent to protect the facility, your duty seemed simple enoughuntil the invasion.Download the DOOM 3 demo to begin your assignment at the UAC Mars research facility. Explore and battle through the first chapter. Includes 3 levels.

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