The game begins with a very peaceful evening in the Mushroom Kingdom where Mario sees flying crystals in the sky. The next day, he receives a note from Bowser that contains both an apology for doing bad deeds and an invitation to his castle for a feast. Mario gathers up Luigi, Toad, Yoshi, Peach, Daisy, Wario and Waluigi to go Bowser's castle. Once they get there, Bowser uses his powers to capture and shrink all eight. The miniature eight wake up outside and go on a quest to find the star crystals to restore themselves to normal and defeat Bowser.
- Story Mode: A single player must defeat the CPUs in several boards. * Party Mode: Up to four players play a game on a chosen board. * Mini-Game Mode: The player plays mini-games in which they have unlocked. * Puzzle Mode: The player plays one of five Mario-themed puzzle games.