OMG! have i found the best site for free games.
http://www.1980-games.com/us/"
just thank me later.
nintendo, remakes, action, and sport are the best ones to look at.. you will find the category at the top of the page.
make sure you click on the "correct flag" so its in english.
when i tried to play any of the Arcade games, i got "Applet(s) in this HTML page requires a version of java different from the one the browser is currently using."
so if you get a message like this, just try one of the other categorys, they will work fine