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knock on the door with the cirlce button then wait a guard will come out and then you have to run up to him and take him out then go in and take everybody else out then go into the scientist uniform and then get the two weapons 1 in the room downstairs 2 in the locker by the tv try both lockers then go through all the doors knocking them out with the 2 weapons see the man then exit the same way you come in