Control's new Ultimate Edition requires you connect to the internet to play its single-player campaign - but only once, and only for the disc-based version of the game on Xbox.
Eurogamer understands this is because the disc does not actually contain all of the game's campaign data, the remainder of which is then downloaded. There's no suggestion the game needs to connect online for any other purpose.
The issue was highlighted over the weekend on Twitter by DoesItPlay, which stated it had seen reports players can progress as far as the game's opening maintenance elevator without the internet before being instructed to download the update.