Question about ODST
I have a question about Halo 3: ODST. Everytime I go into play campaign, it says I don't have a saved campaign game. So that means I have to play a level ive already beaten so I can get to the mombassa streets and look for a level I haven't done yet. Why is this? Is there a way to get to mombassa streets easily? I try the first level, but I have to go through a tutorial and and then most of the paths are shield doors and are off limits.