When we recently showed a game that teaches sustainable building, commenter Joyce said "That is a great idea! Is there an American counterpart?" and what should turn up as part of NBC Universal's GreenWeek but "Build your own green home," that lets you "mix and match components and build the most efficient home possible." It has some nice features, such as adapting for different climates, and including apartments as an option, but is ultimately pretty limited in its range. Try it out and ::Build your own green home.