Instructions
Insert a game disc in your PS3 console that supports co-operative mode. On the back of the game box there will be specifications detailing whether or not the game is co-op.
Plug as many controllers into the ports on the front of the console as there are people intending to play in the co-op mode. You can add up to four controllers.
Select "Co-op" mode from the main menu screen of the video game. Select the number of players in the game.
Begin a new game and the screen will be split into as many quadrants as there are people playing the game.