(Jun 2012) Lego Creationary: A's current favorite. Simple premise -- given four images in a certain category, guess which one is being built in the central build area. It's sometimes tougher than it sounds since Lego blocks are naturally more angular and don't give away hints towards how they model curves. Good way to improve observation and puzzle-solving capabilities. Not to mention fun. Hopefully they will update frequently with new categories and content.