Hmm. I just realized that it should be possible to play my game, Martian Mud Wrestling (http://www.ee0r.com/games/mudwrestle.html), with just two Treehouse sets, one Rainbow and one Xeno. It would be very confusing, and take some concentration to remember which pieces were yours and which not, but it's *possible*. The variation in transparency and colors might add some excitement to the game, if you don't let people look inside stacks. Hmmm. -- Elliott C. "Eeyore" Evans eeyore@xxxxxxxx