Secret Characters:
At the New Name" screen, press L, C-Right, C-Down.
Lines mini-game:
Enter LINES as a name.
Level select:
Enter [Saturn][Spaceship][Rocket][Heart][Skull] as a name.
View vortex sequence:
Enter VORTEX as a name.
Bonus music:
Enter G[Alien head]MEBOY as a name.
View credits:
Enter CREDITS as a name.
