I found a version of Rainbow Six 3 that works on my pearl. There are 3 different ones that all work. The resolution is off, but they are free. One is full screen but the others are smaller. The one that goes full screen is too big and you can't see everything but it is still fun. Remember I use the pearl, so I don't know how it works on bigger berry screens.

Free Games Blackberry Pearl 8100 Software / Pearl 8100 Games - Downloads