There is a marked difference between 'kiddy' (appealing to kids) and 'all audiences'. Mario is a game that anyone can play at any age. There don't need to be adult-targeted themes in every type of game. Mario games are very unique and special because they don't target any specific demographic. In my 25 years of gaming I have never heard an adult refer to Mario games as 'kids games'. They are only ever called 'games', and it's because of their ability to do what very few games in history have been able to. I believe the premise of this thread is baseless.