Tetrisphere

Vortex Code
Type in the word VORTEX at the new name screen, then press and hold RESET on
the console. Hold this and you will see an animation of robots getting sucked into a vortex.

The Following are entered at the new name screen.

Secret Characters
Press L, C right, and C down.

Play the Hidden Game
Enter the Name LINES.

View the Credits
Enter the name CREDITS

Hidden Tunes
Enter G(Alienhead)AMEBOY

Access to all levels
Enter(SATURN)(SPACESHIP)(ROCKET)(HEART)(SKULL)