Not as good as the first, but still an allright game.
Story: The game begins in the past, where Baby Mario and Luigi visit the Baby Princess's castle for a playdate. Its interrupted, however, when Baby Bowser swoops in and kidnapps the Princess. Meanwhile, back in the present, the Shroom Princess takes over the castle and Adult Mario and Luigi must go back in the past to save the world.
Gameplay: Instead of just taking over Mario and Luigi, you can now take over their baby selves. These little guys piggyback on their adult counterparts. They can be used to get into small places and other things. The combat takes full advantage of these babies as Mario and Luigi use them to their advantage. Instead of Brothers Attacks, they use special objects such as shells, various flowers and other items.
Bottom Line: Its not as good a storyteller as the first, as I found myself second-guessing the writing at certain points. The combat is smooth and productive, and the progression system has been improved greatly. The final boss is a letdown sadly.