Just in case anyone's getting together with their gaming groups this weekend, let me give you a little something to try. Now that Treehouse is the flagship product in the Icehouse line, I'd love to see how Zendo with four Treehouse sets "works". I would guess that, given the current mix of rules, existing koans will have to be cannabalized more often because there is only four large blues instead of five. Of course, you could just use absolute color rules less often or rate such rules as being relatively more difficult. Either way, I'd love to hear any playtest results. Yes, I know that five Treehouse (of the same color scheme) would give you a superset of the Zendo set, but that would crank the price up one more MSRP. (What is it? $9?) How is Zendo for less than $40 plus stones? Ryan