Release Date: April 15, 2004
There is a parallel universe called the Mirror World, with a mirror-like entrance that exists high in the skies of Dream Land. It is a world where any wish reflected in the mirror will come true. One day, however, it only copies evil minds, and rapidly changes the world into a world of evil as a result. Meta Knight notices this and recognizes this as a threat to not only the Mirror World itself, but also to his native Dream Land, and visits the Mirror World to save the two worlds.
Meanwhile, Kirby is taking a walk, when Dark Meta Knight - an evil Mirror World version of Meta Knight - appears. Before Kirby can react, Dark Meta Knight slices Kirby into four differently-colored "Kirbys". At this point, they have to share the same Warp Star. Kirby normally travels alone, but if his Cell Phone is working, he can call his friends and they will help him. The four Kirbys chase after Dark Meta Knight and enter the Mirror World.
The two Meta Knights fight each other, but the real Meta Knight is defeated. He is knocked into the mirror, which is then cut into eight fragments by Dark Meta Knight. Those fragments are then scattered across the Mirror World. It's up to Kirby and his new "clones" to save Meta Knight, the Mirror World, and Dream Land.