I just checked it out and no there is no co-op. I've had this game for about 6 to 9 months now and never played until about a week ago. I was playing games with some friends and decided to put it in. I had no idea it was that much fun. Playing with four people and with your AI teammates and opponents was mayhem and fun. After that I played the single player and once again found myself wondering why I had never played it before. The only downside is that the game is short (I already finished it), but it's got a level of polish that more than makes up for it. I found it and Metal Arms - Glitch in the System for $20 a piece. It's definately worth a purchase at that price. Don't think about it just pick it up.