How do you transfer data from one game to another?

I want to make a 1-player game and another game where the players can meet together and battle with each other. In order to do that, I need to retrieve the players' stats from the 1-player game. How would I do that?

This can be done with the use of Games/Universes and DataStore.

Within a Game (Universe) there can be multiple places, which all share the same data stores. That means you can grab the stats from the 1-player place in your multiplayer place, and vice versa.