It sounds like the platform really matters for Roblox, if it's that much of a creative tool. BTW the first time I'd heard of "ActiveWorlds" (or Uru) was just now from your comment. And it also sounds like my kids don't have the problem Roblox solves! (And I don't really want them standing around in a chat room looking for things to do; absent a compelling reason to look at a screen, I encourage them to do real-world things.)