How do you unlock more worlds in Roller Coaster Rush?

- Clear World 1-15.

- Complete 15 goals.

World 3

- Clear World 2-20.

- Earn all stars in World 2-1 to 2-5.

World 4

- Clear World 3-10.

- Earn all stars in World 3-1 to 3-6.

World 5

- Clear World 4-25.

- Earn all stars in World 4-1 to 4-6.