Bikkuri Mouse

You probably see this painting game and instantly think "Mario Paint," but it's actually much more, just released by Sony Japan, Bikkuri Mouse doesn't just let you draw, but also interprets everything you make into full pictures. So say you draw an orange circle--the game might change it into a sun. Or a straight green line could turn into a flower. How your designs are transformed depends on which of the six stages (each has its own theme) and what color paint you choose (with brown paint that same straight line could become a monkey on a vine right instead of a flower). A few supersimple Game and Watch-style minigames are also included, in case you get bored of all the drawing. The other cool feature is you can use almost any USB mouse to play BM--just plug it into your PS2 and go!