Hold 1 + 4 + 7 + A at the main menu. The word "Excellent" will be spoken to confirm correct code entry. The following codes may now be activated during game play.
Activate Warp bonus round
Begin game play in Tempest Plus mode. Hold Option to reach the rainbow web levels to play on invisible webs.
Enable rotary control:
Hold Pause on controllers one and two at the option menu. The word "Excellent" will be spoken to confirm correct code entry.
Rotate web preview:
Press the D-pad at the level selection screen.
Press Pause when the first "Jupiter" warp level starts. Select the music volume option and wait until sheep can be heard later in the song.