In the night sky, past the moon and beyond the stars, there's a dream world known as Dream Depot, where everyone's dreams come together. This is the real land of dreams... In this land, there are Star Guards who protect the dreams of all.
One dreamy night, the Star Guards thought of something.
"Many dreams arrive here at Dream Depot every day," they said, "so... why don't we offer those with the power of dreaming a chance to visit?"
In the end, they decided to invite Mario and his closest friends because, when it comes to dreamers, nobody dreams bigger than they do!
So the Star Guards prepared for their guests' arrival by creating many fun-filled games for them to play. And that is how the story of Mario and his friends both old and new began!
In Story Mode, Bowser and Koopa Kid are planning to ruin everyone's dreams, and players must stop Bowser from taking over said dreams. If players clear four out of the six default boards, they must face the Koopa Kids in Bowser Nightmare, and if they beat that board, they fight Bowser in Frightmare.