Hey guys,
This jam is about improving your teamworking skills where you make a post in the community page of the jam about a game that you have already built. After that other members can see your post and see if they want to combine elements of their game with yours. In a way, you will bring attention to your old game as well as combining legacy codes to make something new, giving you some very good skills and maybe even a fair critique of your coding methods from a fellow game developer.
The submissions can be combined in many ways such as jumping through a portal from one game's universe to the other, doing something there and returning back to your game. The universes can be combined with or without switchable protagonists or even simply extend your game with assets from the other game.
How you want to work with the other person is entirely up to you and what you want to share. That in essence will help in improving your skils in working with other people. The JAM only forces you to not work alone. You can find the JAM here: