Kirby 64: The Crystal Shards Cheats

At the title screen hold L, R and Z, while holding those push the A button and Kirby will say "hii!"

You can open up sound check by beating Miracle Matter.

You can boss battles by beating O2.

To access the higher difficulty settings for the mini-games, you must beat the difficulty setting before it. In the beginning, beat the Easy setting to unlock the Normal level. Beat the Normal level to open the Hard level. Then, beat the Hard level to access the Intense difficulty level.

To open up the secret planet Dark Star, collect all 100 shards and beat Miracle Matter once more. Dark Star will open up. At the end of the planet, you will fight the TRUE final boss, O2.