You know, it occurs to me that the big problem with this is how to depict multiple D100's rolling on the screen. If someone were to play with it and roll, say, 20D100, would you get 20 individual D100 dice rolling around the screen? Or would you get a total of 40 D10 dice rattling around, 20 for the 10s die and 20 for the 1's die? I have no idea which would be easier to implement. Perhaps a way to approach it is to implement multiple color dice rolls and allow the players to assign which is which? That way you can have someone say that their percentile dice will be black and red, and that black dice are the 10's and reds are the 1's. You could also expand that to include D1000 by having 3 colors for dice, Say black, red and blue. But when you roll, all you get is a bunch of D10's of varying colors. Just an idea.