Scary but its a rip off
THIS IS QUAKE, they should have not sold this without a disclaimer. Basically the exact same game.
A massive demonic invasion has overwhelmed the Union Aerospace Corporation's (UAC) Mars Research Facility, leaving only chaos and horror in its wake. As one of only a few survivors, you must fight your way to hell and back against a horde of evil monsters.
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 enough until the invasion. Now, in an epic clash against pure evil you must fight to understand who is with you, who is against you, and what must be done to stop this nightmare from reaching Earth. DOOM 3 draws you into one of the most frightening and gripping 3D gaming experience ever created.
Notice: This Game Requires a Macintosh Computer