I just got Halo 4 and everyone on my dorm was psyched to play it. However, when I booted up the multiplayer, I couldn't bring anyone else with me into an online match. I haven't played online shooters for a long time, but I distinctly remember having a person sign in as a guest with a second controller and play Halo 3 with me online in a casual match against random people on the internet. Can I do that on Halo 4 or am I just boned? And are there any online options if you have people signed in as guests? Online co-op, spartan ops, etc?