The games may require Adobe Flash Player plugin installed to run. It's inside the "Flash Game Player" folder. Also given along with it are two flash game players that can open .swf files. It's always convenient to have a separate flash player to play these games, though it's well known that you can play them inside your web browser. So, to do more things with these games and have advantages such as playing them in full-screen mode you have the option of installing the flash game players given.
Comments and rating of games will be appreciated and helpful for others.