The single-player mode of Portal 2 has automatic saving, but the two-player mode does not have automatic saving, so some players don’t know how to save online. In fact, the two-player mode does not have the saving function, but they can directly enter the single-player level.
Answer: Portal 2 duo cannot save
However, in online mode, we can press the esc key to enter the transfer station. Here, we can freely select levels. As long as there is a player on both sides of the connection who has played before, everyone can enter.
Through the above method, you can skip the previous levels and play subsequent levels, but the progress in the levels cannot be saved when two people are online.
If you exit halfway through the game, you will have to start over again the next time you enter the level.