Programmer high scores
Press Right(2), Up(2), Down, C at the title screen.
Press Up, Down(2), Left, Right, B at the title screen while "Press Start" is blinking. A sound will confirm correct code entry. Note: Only one level may be played if this code is enabled.
Hold A and press Up, Down(4), Up at the title screen while "Press Start" is blinking. Use the D-pad on controller two to change the appearance of the clouds and other effects.
Pause game play and press A, B, or C.
Move behind an object and press B.
Secret Special Stage
In the sound test menu, put 07, 07, 07 in all sound modes, and then press Start. A message like ''WELCOME TO THE SECRET
SPECIAL STAGE'' shall appear. Complete this and you'll get
something special in return.
View best ending movie
To view the best ending movie, collect all the Time Stones, and get the good future for every level.
Beat the Time Attack Mode under 25'46''12. You'll open up a new option in the main selection screen called Visual Mode.
Enter these numbers at the sound test:FM no.46, PCM no. 12, DA no. 25 then press start. A Japanese message with creepy sonic should appear.
Secret Demo Mode
You must first beat the game in Time Attack Mode in under 37'27''57. Then return to the title screen to find a new option open: