The only suggestion I have is that you specifically create a list containing only those particular categories and see what games come up and try them. The categories come from catver.ini, and I'm not responsible for their content.
You could perhaps google around on catver.ini and check to see if there are descriptions of what each mean, or simply ignore 'em altogether.
Usually, the categories are used to remove particular types from ending up in your final list- like getting rid of mature titles, or mahjong games are the two most common exclusions.
BIOS is the only one that is not actually a game type. BIOS is a support ROM, for running the game, not a game itself. I would not suggest creating a list of just BIOSes and playing them-it won't be too fun.
