This game is a Sequel to New Super Mario Bros. The Finnaly and The Super Mario series itself. It stars Luigi with his own enemy and His own damsel in Distress. Luigi now has his own supporter and princess. It starts after the Mario era where Peach and Toad are Not main characters anymore. Yoshi still stars though.
It starts out with Luigi, Peach, Toad, and Yoshi walking back from Bowsers Castle. They go back to The Mushroom Kingdom Castle where a Funeral is hosted for Mario. Donkey Kong and Diddy Kong, Wario and Waluigi, Cranky Kong, Daisy and Rosalina, Nabbit, Toadsworth and Toadette, Yellow and Blue Toad, All of the other Toads, Yoshi, Link, and Peach, Toad, and Luigi show up. While at Bowsers Castle The Koopalings, Shadow Mario, Boom Boom, Kamek, Koopa Troopa, Goomba, and Bowser Jr. are there. Then King Boo comes in and Threatens all who oppose his Rule will be thrown in Lava and All of his guards surround them. Shadow Mario and The Koopalings Oppose and our tossed in Jail. Meanwhile Luigi goes home and hangs up a new picture of Mario and sits on his couch and watches T.V. Then all of a sudden Professor E. Gadd shows up on his T.V and beams him to the Gloomy Manor. He shows Luigi the surveillance of Bowsers Castle and then shows how Princess Daisy is Kiddnapped and That he must save her! Luigi says but i can't do it alone. I need help. then Gadd tells him to go find Waluigi.
This game consist of 4 worlds with 10 small missions each.