The game takes place four years after the events of Rise Of Shadow. The Death Squad had been revived with Rowland as it's leader, also including new members like Marrow and Glastor. However it has been shown that Ripper and Boon have nothing to do with the Death Squad. The members of the death squad attacked the Crescent Moon Island and surrounding islands scouring them for the ancient Crescent Shards. When all assembled they create the Crescent Stone which can be used to awaken the greatest power in the world. Mario and his old team heard of this happening and they rushed over.
The controls are the same as the previous game. All members of Mario's team including the optional ones are playable from the start. Characters can be periodically unlocked or recruited throughout the games chapters. There are also more side-quests available topping the old games seven with a whopping 237 side quests available.
The prolouge begins with Mario and Luigi on the upper deck of the S.S. Fireball. They are discussing the Cresent Moon Shards when all of the sudden a group of Shadow Pirates lead by a member of the death squad called Dreas. After mario and his team defeat Dreas an explosion is heard below deck. The team rushes below deck to the Boiler Room where another member named Ragni has blown a hole in the side of the ship. Ragni and Dreas then proceed to retreat leaving Mario and company to drown. The ship is able to make it to Port Wheldes on a nearby island. The chapter then ends after the villages elder tells the story of the Shards.
Boss:Dreas and respawning Shadow Pirates