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Nintendo 64 - Tetrisphere cheats

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.