Summary

 Kirby & the Amazing Mirror (referred to by the community as KatAM) was released in 2004 for the Game Boy Advance. Two features make it stand out from other games in the series; its open world layout, and its cooperative multiplayer.

 The plot involves a realm called the Mirror World, separate form Dream Land, which has been corrupted by Dark Mind. Seeing this, Meta Knight rushes to the Mirror World's aid. Soon after in Dream Land, Kirby is attacked by Dark Meta Knight and is split into four different copies of himself. Giving chase to DMK on warpstars, the four Kirbys journey to the Mirror World to sort everything out.

 After completing the game's first three rooms and arriving at the game's main hub, Dark Meta Knight shatters the large mirror that leads to Dark Mind into eight pieces and scatters them across the world. Each of them are guarded by a boss, which can be defeated in any order (usually after defeating the first boss King Golem).

Amazing Mirror has a stigma in the Kirby Speedrunning community for being a very RNG-heavy speedrun with reset-heavy bosses, as well as its over-reliance on the wheel copy ability (which is the best its arguably ever been in the franchise).

Kirby & The Amazing Mirror
Abbreviation — KatAM
Katam.png
Details
Developers Flagship
Release Dates JP: April 15, 2004
EU: July 2, 2004
NA: October 18, 2004
Platforms Gameboy Advance, Gamecube, DS, Wii U
Nintendo Switch (coming soon)
Categories
Main Any%, 100%
Miscellaneous Boss Endurance
Extensions Any% NCA, All Sprays, All Goal Games

This is where the game's NavBox temple is going to go.