'The game will remember you have played this late-game mission once you naturally work your way to it in your own campaign, and you will not be required to play that mission again,' says Boone. For example, if you're in the early-game missions and you join a co-op partner who is deeper in the story, you won't have to replay any missions you play to completion in the session. Any mission progress you make in the co-op session is brought back into your single-player save. Collectibles, customization, vehicles, and weapons all follow you back to your single-player game, but Volition didn't stop there. When a mission starts, progression is tracked on a per-player basis.

When you join a session, each co-op player looks exactly how you have them customized without limitations. Co-op play is untethered, meaning you can explore the city independent of one another, but if one player enters a mission, the other warps to them and joins the task at hand.

In the upcoming 2022 reboot of Saints Row, you can participate in two-player, drop-in/drop-out online co-op as you explore the city of Santo Ileso.

Saints row 3 website