Complete level 1.
Complete level 2.
Complete level 11.
Complete level 12.
Complete level 13.
Complete level 14.
Complete level 15.
Complete level 16.
Complete a special level.
Complete level 3.
Complete level 4.
Complete level 5.
Complete level 6.
Complete level 7.
Complete level 8.
Complete level 9.
Complete level 10.