Pros: Everything
Cons: Nothing

I have 5 words for you. This game is very cool. It is one of the largest game boy games in existence. It has incredible graphics and sound. This game just blew me away. Not only does it look good, but it's fun, too! Rayman in and of itself is a very unique concept with the main character having hands and feet, but nothing to connect them to the body. Ubi Soft did a marvelous job putting such a person on Gameboy. I chose this game because it looked good. I was not disappointed when I played it. It has so much to do in it and it's well above most other GB games as far as graphics are concerned.
If you like Rayman, you might want to also try him on the other consoles. He's so different, I can't think of another game that is similar. Ubi Soft hasn't done much for the portable market...until now.