Tetrisphere

Cheat mode:
Enter the following codes as name:

View vortex sequence: Enter "VORTEX" then, hold the reset button.
View credits: Enter "CREDITS"
Lines mini-game: Enter "LINES"

Select any stage: Enter "[Saturn][Spaceship][Rocket][Heart][Skull]".
After hit L + C-Right + C-Down to enter the special characters
in the name.

Audio screen with 9 song: Enter "G[Alien head]MEBOY".
After, hit L + C-Right + - C-Down to enter the special character
in the name.