Unlockable: Level Select

At the title screen press RUN, then hold Button 2 and press RUN the number of times shown below.

For level 2, press RUN 5 times.
For level 3, press RUN 15 times.
For level 4, press RUN 25 times.
For level 5, press RUN 100 times or more.



Unlockable: Sound Test

At the title screen, hold Button 1 + Button 2 + SELECT, then press RUN.

Unlockable: Increased Difficulty

To unlock an increased difficulty level in which you play through the game, insert the following code at the title screen: Hold Up, the II button, and Select, and then press Run.