Kirby & the Amazing Mirror (JP) is a platformer video game released on the Game Boy Advance in 2004. The game is a side-scrolling platformer that stars the eight inch tall Kirby, though is the only title in the series not to feature King Dedede.
The gameplay is different from the other games in the Kirby series, as the levels are less linear and are more maze like, though not as dramatic as Metroid video games tend to be. A major new gameplay mechanic is Kirby's cell phone. He can use it to call 3 different-colored Kirbies to his aid. Most of the time these Kirbies are for optional use, but sometimes they are required when replaying the game. The cell phone can also be used to call the Warp Star and take Kirby back to Rainbow Route.
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. But before Kirby can react, Dark Meta Knight slices Kirby in four and Kirby becomes four different colored "Kirbys". Kirby travels alone, but if his cell phone is working, he can call his friends and they will help him. They chase after the Dark Meta Knight and enter the Mirror World.
The two Meta Knights fight each other and the real Meta Knight is defeated. He is 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.
There are nine worlds; Rainbow Route, Moonlight Mansion, Cabbage Cavern, Mustard Mountain, Carrot Castle, Olive Ocean, Peppermint Palace, Radish Ruins, Candy Constellation.