I gotta tell you though, there have been a few co-op games where my friends and I simply wanted more levels. Don't change the engine. Don't add more character i

I gotta tell you though, there have been a few co-op games where my friends and I simply wanted more levels. Don't change the engine. Don't add more character items/guns. Give us more story and levels to play in. The novelty coming from applying well known stuff to new scenario. In non-co-op land, Half Life 3? Just finish the damn story Valve!