https://www.gamespot.com/articles/wolfenstein-2-the-new-colossus-features-an-awesome/1100-6454401/

Wolfenstein II: The New Colossus presents players with a full single-player campaign and ample opportunities to shoot Nazis. It's a single-player-only game, with no multiplayer component at all, but there is more to it than just the base campaign. Spoilers for a Wolfenstein II Easter egg lie ahead.