Here is another decent Tower Defense game for you mouser
(and everyone else, of course). It isn't terribly difficult but they do have a few twists that are interesting. I haven't tried them all out, but the multipath ones are rather fun. Gates is an interesting, but ultimately boring (to me) alternative. I am looking forward to trying Maze, but haven't got that far yet. You can give it a shot here:http://www.games.pixelshocks.com/tower2/
Okay, having issues with the expanding thumbnail.
Sure, now it works.