Kirby & the Amazing Mirror - Platform: Gameboy Advance

Sound Test:
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Find the CD Treasure (Find Musical Scores to unlock new tunes in it).

Use Metaknight's Sword:
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Defeat the final bosses.

Boss Rush Mode:
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Get 100% on a file.

Different Kirby Colors:
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Find cans of Spray Paint spread throughout the game.

Open the Power Center:
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Find and hit all of the Portal Switches in the different areas.

Do not let Bosses to Waste:
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After defeating a boss, before it disappears, you can suck them up to change your power 
to the boss's power.

Ability Room:
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During game play, activate all the warping mirrors.

Defeat Kracko:
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Get the Tornado ability before you get to him. When you reach him, hold B. 
Kirby will spin and go up. While spinning, keep hitting Kracko. Keep doing 
this until his life is gone. You can also do this with other Bosses.

Arena Mode:
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Collect 100% of the treasures during game play.