OK, first of all, this game is impossibly addictive. I played it Sunday afternoon, finishing all the levels in one sitting. Second, it is hosted at a British museum website. Third, it is - or has the potential to be - quite educational, even without having learning outcomes or anything silly like that. Why, it's not 'serious' at all! And fourth, it lets users create even more games on the basic platform. Try it. You'll see what I mean. And don't blame me if you don't come back from lunch.