Kirby & the Amazing Mirror, known in Japan as Hoshi no Kirby: Kagami no Daimeikyū (星のカービィ 鏡の大迷宮 Hoshi no Kābī Kagami no Daimeikyū, “Kirby of the Stars: The Great Mirror Labyrinth”), is a Kirby video game released in 2004 for the Game Boy Advance. Kirby & the Amazing Mirror is an adventure-based game.
There is a Mirror World that exists in the skies of Dream Land. It is a world where any wish reflected in the mirror will come true. However, one day it only copies evil minds, and rapidly changes into a world of evil. Meta Knight notices this, and flies up to save the Mirror World.
Meanwhile, Kirby is taking a walk when Dark Meta Knight appears. Before Kirby can react, Dark Meta Knight slices Kirby in four and Kirby becomes four different colored “Kirbys”. They chase after Dark Meta Knight on a Warp Star simultaneously and enter the Mirror World.
The two Meta Knights fought each other until the real Meta Knight is defeated. He is then knocked into the mirror, which is then cut into eight fragments by Dark Meta Knight (which are then scattered across the Mirror World), so Kirby must save Meta Knight and the Mirror World. After collecting all eight mirror fragments, Kirby enters the Mirror World and battles Dark Meta Knight. After defeating him, a vortex appears and sucks Kirby in, who is given Meta Knight’s sword. Kirby then proceeds to fight Dark Mind, the true mastermind behind the Mirror World’s corruption, multiple times. Upon defeat, the Mirror World is saved, and Shadow Kirby(the Mirror World counterpart of Kirby who is believed to be an enemy, now ally) waves his goodbyes to the 4 Kirbys as they all exit the Mirror World via mirror door.