I haven't used it in a while. but you have to download the roms to play. and you have to download the original game and not a clone of the game, because the clone will generally use files from the original. So to play a lot of the different versions and sequals you'll need the original.
Mame32 will display all the games possible to play whether you have them downloaded or not. You may have to refresh the game list or create the game list to start.
-jack
http://www.bredberg.org/nes/bestGame.php
