 The game has five worlds with roughly twelve levels apiece . Some levels are action @-@ only while others include puzzles . The player 's goal is to reach a warp star at each level 's end . En route , Marina shakes enemies , breaks blocks , uses weapons , and rides " bikes " and objects along wire path mazes . Each world has both final and mid @-@ level bosses . The levels and boss fights use scaling and screen rotation special effects to vary the gameplay . 
