Python files here are complete games. Some games are inside folders because they need more than just a python file to run (they may require music, images...). This is a way to keep things more organized. If you don't need a game, you can just delete its folder.
Just execute a game in this directory. If the python file is not in this
directory, because it's inside a folder, go inside its folder and execute
the file called main.py
.