i don´t know if it has been posted before,so i do it:
there are hidden games in flash mx (actually it´s a collection of all hidden games from the previous versions).
you have to open the about panel and click on the x.it is a very pixel precise check (you have to hit exactly the point which is slightly right (and a bit on the lower side) from the center of the x where the parts of the x connect.you also have to be online (maybe there will be more games in the future too ? ) enjoy