To activate Mumble Mode, open up the game menu while playing – you can do this by pressing up on the d-pad, or the map button (TAB on PC). From here navigate to the far right menu which will be titled Extras (Last in the List, Questionmark Symbol).

Scroll down through the Datacards, and if you’ve not been playing for long, you’ll likely see Mumble Mode is the only option you can freely use from the start.

Mumble Mode replaces every voiced dialogue with grunts and mumbles. The actual story sequences themselves are not altered, however. This means that if a scene doesn't have a visual gag, it won't translate well to Mumble Mode.

Mumble Mode can be enabled and disabled at any point.