Instructions
Initialize the "Call of Duty: Black Ops" game disc in your game console and press any button to enter the main menu.
Scroll down to "Options," select it, and then modify the desired settings that will affect the Zombie portion of the game. Next to "Graphic Content," select "Reduced" or "Unrestricted." Next to "Look Inversion," select "Disabled" or "Enabled." Next to "Controller Vibration," select "Disabled" or "Enabled." Next to "Aim Assist," select "Disabled" or "Enabled."
Play around with the rest of the settings, such as "Stick Layout," "Button Layout," "Look Sensitivity," "Audio Settings" and "Brightness," until you find the settings you like best. When done, press the "Back" button and select "Zombies" to enter the "Call of Duty: Black Ops" Zombie game mode.