Sonic's Secrets: Afterburner 2.

Stage Select

To access the Stage select screen press the Start button to bring up the start screen (see right). Then press and HOLD:

A + B + C (Together).

Now press Start to bring up the level select screen (see below right).

Use  Left & Right on the D-Pad to select the stage and press Start to begin play.

Extra Missiles

Before you reach the refueling plane (see below), press the following buttons depending upon the stage:

 Stage No.  Press Buttons
   3  Left + B
   5  Right + B
   9  B
 11  Right + B
 13  Left + B
 16  Right + B
 19  B
 21  Right + B