I bought left 4 dead and under versus mode you can play as a zombie. So me and my son were going to play 1 and 2 player. First it said both accounts need to be signed in to xbox live. So i created a second xbox live account and tryed both of us signing in. Then it said you need to have an account with multiplayer privileges. Is that some thing you can change through your settings or do i need to upgrade to xbox live gold ?