Unlock all marbles and music; successfully complete all bonus stages, secret stages, and the 45 regular stages in both standard and Mirror modes.
Earn 25 gold trophies to unlock five bonus stages. Note: The gold trophies are also available in Mirror mode.
Before you've all 20 balls, always try to gain a trophy in the stages.
Each stage has 1 hidden green crystal, collect them to unlock the secret stages.
To unlock the bonus stages you can collect gold trophies in the mirror mode as well.
All green crystals are either hidden, hard to get, or both.
Press 2 after you complete all the stages, including the secret ones.