If you are speaking of Destiny, yes. An internet connection is 100% required. As for being able to solo, you can do that too. Bungie has already stated that you [i]can[/i] run the entire campaign by yourself. You will miss out on a lot of the other aspects of the game, however. Best bet is to run solo for a bit, then team up with people occasionally just so you get to experience everything Destiny has to offer. But as your post doesn't have a #Destiny tag, i'm not sure you are indeed speaking of that game. One tag does say Halo, and to date, i don't know of a single Halo game that [i]requires[/i] an internet connection, so I don't know what the worry is. If you're speaking of Halo, that is.