Mario & Luigi: Partners in Time takes everything good about the previous installment to a whole new level.
Mario & Luigi: Partners in Time is an RPG that follows a quest of Mario and Luigi to rescue the Princess. But in the storyline, they run into baby versions of themselves(hence the name Partners in Time). Then Mario and Luigi learn that there is an evil copy of Princess Peach. The copy is Princess Shroob, leader of the Shroob army. So Mario, Luigi, Baby Mario, and Baby Luigi set out to defeat Princess Shroob and find Princess Peach.
As the title says, you will have to go to and from the past to defeat enemies to find the Cobalt Star Shards. The shards come together to form the Cobalt Star. I won't spoil anything about it.
This game has a storyline that will keep you guessing. It will make you want to complete the game so you can figure out the storyline. The gameplay is fantastic! There is a Turn-Based battle system that some of you may remember from the Paper Mario series. You will use all of the Bros to use team-attacks on your ememies. If you complete all of the extra stuff in the game, it should last you around 30 hours.
This game is a solid RPG with funny diolougue, funny characters, epic boss battles, and tons of other great stuff to do. I would recommend this game to everyone who has a DS and likes Mario games.