In this you would develop your own Ghost agents to try and capture an agent or user controlled Pacman. This was very useful in playing around with different AI techniques. More to your question, the levels in that framework are actually built out of a graph and not a 2d array. You might take a look at the code to see how they do it.
0 Crossposting this from streamlit.io I have been having issues with ghost / shadow / mirage (or whatever it may be called) that is left by a widget, generally after a change of session_state and with a corresponding change of widgets showing on page. I do have a hacky workaround and a somewhat deeper insight into what is causing the issue.