Worlds and stages[edit]
The game consists of eight worlds, each of which consists of three levels. In each level, the screen will scroll constantly in one direction. The direction depends on the stage and Wii Remote Hand. Players must collect a pearl to complete the level. To collect a pearl, players will need to find three medals. Medals are hidden within each stage, and are sometimes carried by enemies that the player must hit. If the player falls back to the edge of the screen for too long, he/she will get eaten by Hydracoil, and will lose a life. If the player loses all of his/her lives, the game is over. If the players collects a pearl in all three levels, a boss stage is unlocked in each world. The world is cleared after the player beats the boss.
Mini-games[edit]
If the player gets an A ranking in all three stages of a specific world, a mini-game option will appear on the world's selection screen. Each mini-game shows instructions on how to play it. If playing with a friend, players will see a gold icon for a competitive game and a blue icon for cooperative play.