Tetrisphere

Level select:
Enter [Saturn][Spaceship][Rocket][Heart][Skull] as a name. Note: press L + C-Right + C-Down to enter the special characters in the name. Any level in any game mode may be accessed.

Lines mini-game:
Enter LINES as a name. The object of the game is to remove an area large enough to released the trapped character. Line up three pieces in a horizontal or vertical line to remove them.

Bonus music:
Enter G[Alien head]MEBOY as a name. Note: press L + C-Right + C-Down to enter the special character in the name. Enter the audio screen to access nine additional songs.

View vortex sequence:
Enter VORTEX as a name. Hold the reset button. A sequence showing all robots being sucked into a vortex will be displayed after several seconds. Release the reset button to end the display.

View credits:
Enter CREDITS as a name.

Hint: Unlock various levels:
Enter any of the names at the high score screen as your name to unlock all levels that player previously completed.