In the options mode choose 'Full Instruments' and press B on controller 2 while playing the game.
Fly Original Dragon
To play as the original Dragon from PD1, set the instruments on Full and take routes 2, 2, and 3 on the appropriate levels.
Fly Sky Dart
Take routes 2, 2, 3, 1.
Open All of Pandora's Box
After playing the game for 30 hours, all of the options in Pandora's Box will open up to you. Space Harrier and Dragon ModeOnce all options are open in DPandora's Box, go to the life selection. Choose Lundi for Space Harrier Mode and Lagi for Dragon Mode.
Self Destruction
Press A+B+C+L+R at the same time while playing the game.
Speed Code
At the title screen press Left, Right, Left, Right, Up, Down, Up, and then Down to double your speed.
X-Y Radar
Press A on controller 2 while playing the game to enable the radar.