Clickomania - a free download
My kids and I've been playing Clickomania for years -- the version I have is called the Classic.
Now, there's Clickomania Next Generation--it's still the same game, you click on groups of like-colored stones and trying to elminate them all and it's kept the features that let you change the tiles, sounds, backgrounds and animations, but the overall look is less like a Windows application and more like a game.
It also has a "whole new application architecture", but since that's way beyond me, I'll just go ahead and play while you try to figure that one out. :-)
