The second player can join at any time taking over the control of Mac.
The fourth game in the series isn't a traditional platformer and instead goes the Mario Bros. route with a single screen full of enemies on different levels. The goal is to defeat all enemies and move to the next level.
This page contains co-op info for Joe & Mac Returns on the PC. All information about Joe & Mac Returns was correct at the time of posting. Information is subject to change. If you see any errors please email us.