i remember that old game on the mac where u gotta try to stop bill gates from installing windows onto all the computers else theres always barney carnage
i don't have a mac but so don't know how they run. Do you mean online games? if you do, play an rpg or the ones you buy such as Battlefield 2, Battlefield 2142, Counterstrike 1.6, Counterstrike:Source or half life or something liike that -ann Online rpg.. do a google search
Blizzard has many games for Mac (World of Warcraft lol) If you have the new Intel/Mac, you can runs Windows on your Mac using Bootcamp.
I got a site that has got some good rpg games, but you may need to find the cracks yourselfs. http://www.spiderwebsoftware.com/products.html just download from the macintosh area.