Things You'll Need
Instructions
System Link
Turn off both Xbox 360 consoles before connecting them. Use a long enough Ethernet cable to make the connection.
Plug one end of the Ethernet cable into one of the Xbox 360 consoles' ports found on the back of the system. Plug the other end into the other console.
Plug the consoles into separate televisions and turn them on. Insert a copy of "Crackdown" into each console.
Sign-in using gamertags to be able to save game progress.
Select the "Campaign" option on the main menu when "Crackdown" loads. Select the option for "Co-Op" gameplay and then choose the "System Link" option.
Xbox Live
Connect the Xbox 360 console to the Internet via a wired or wireless Internet connection.
Turn on your system and sign onto Xbox Live with your gamertag by pressing the Guide button on your Xbox 360 controller and choosing the "Sign-in" option. Your gamertag must have an Xbox Live Gold membership.
Insert "Crackdown" into the Xbox 360 and push the "Guide" button again. Select the "Friends" option and invite an online friend to play a "Co-Op" game. They must also have a copy of "Crackdown."
Select the "Campaign" option on the main menu when "Crackdown" loads. Select the "Co-Op" gameplay option and then choose the "Xbox Live" option.