markdown - Mermaid - How to connect subgraphs in markdown?

Question

I'm using mermaid in markdown.I can't figure out how to connect subgraphs.

Given the program below, I need to be able to connect one and two with an arrow.

 -  ```mermaid
    graph LR;
      subgraph one
        main---MainMenu
        MainMenu((MainMenu))---Game
        Game---Level
        Game---Player
      end
      subgraph two
        Screen
      end
      one-->two 
    ```