OK, here's an interesting additional point about the "2HOUSE" restriction on the Winter 2008 IGDC: I was making a game in which I "required" black versus white--that means two sets, Rainbow and Xeno, right? It qualifies for the IGDC, right? Wrong. Nothing about my new game's rules *actually* required black versus white--it could be red versus blue or any other color versus any other color, so long as you have two dice which are different colors and so long as you assign each die color to a player color. (I have since been noodling with ways to employ more pieces, so that the basic game notion can be used while also requiring more than 15 pyramids to setup.) SO... truly arbitrary color assignments which try to "force" a two-set setup--but which do not actually require two sets, if one chooses other arbitrary colors--will not qualify for the "2HOUSE" requirement for the Winter 2008 IGDC. Color assignments which are critical to play (ex: the additive properties of, say, cyan and yellow) *will* qualify because one *must* use two sets to get *requisite* colors without which the game becomes unplayable. Make sense? Somebody got a problem with that assessment? David