Question: On the back of the Undead Nightmare box, it lists “co-op 2-4” in the offline (Xbox 360) section of the specs. How can I access this co-op play? What is the difference between “co-op 2-4” and “system link 2-16”, both listed in the offline specs?
Answer: The text "co-op 2-4" refers specifically to playing the co-op modes over system link, including Undead Overrun and the co-op missions included on the disc in the Outlaws to the End DLC pack. It is a separate spec from system link because these modes were designed to support up to 4 players. "system link 2-16" refers to online Free Roam and other competitive online game modes that can also be accessed over system link, supporting a larger number of players.
Split-screen play on the same console and television screen is not supported.