My daughter was telling me last night that on her copy of Burnout 3 that she only has one thing available on multiplayer. That is Party Crash. She said that all of the others are locked. I have the XBOX version but I don't recall having to unlock any of the others. They were available right from the start. Could she have a defective game??
Sorry I don't have the game up and running but from what I remember those other options in multiplayer need a second controller, hook up a second controller and they should light up. I'll check it out tomorrow.