This page of our guide explains if you can complete the Wolfenstein: Youngblood campaign on your own, i.e. without using the recommended cooperation mode with the second player.
Yes, it is possible, because the co-op mode is optional (although it is recommended by the game developers). If you do not want or cannot invite another person to the game, you can start the campaign in single player mode.
When you start a new session (Host Game), you can play offline – this is shown in the picture above (Who can join – no one is online).
If you decide to go through the single player campaign, the artificial intelligence will take control of the other sister. The AI sister can take an active part in battles, help solve puzzles, activate Pep Signal, and even “resurrect” the controlled character after you have lost all your health points.
A partner controlled by artificial intelligence is not immortal. She can lose all health points if she is under heavy fire from enemies. As in the case of a “live” partner, it is worth helping her and restoring her to full strength. The death of an AI-controlled sister means the loss of one life from the total pool of lives.
If you have purchased the Deluxe Edition, you can use your Buddy Pass to invite one of your friends to play with you. The second player will be able to download the game and join the competition in co-op mode without any additional fees.