Do all the following codes at the difficulty menu screen. Depends on
 how you config the keyboard. Press [f6] key for your current keyboard
 config. (eg. Zoom1 is default to "A" key)
 
 Infinite continue:
 Up, Zoom1, Right, Zoom2, Down, Zoom3, Left, Zoom2, Up, Zoom1
 
 Stage Select:
 Up, Up, Down, Down, Left, Right, Left, Right, Zoom1, Zoom2, Zoom3
 
 Invincible mode:
 Turn Left, Turn Left, Turn Right, Turn Right, Up, Down, Left, Right
 (It should display "Invincible Mode" after you've type it. Please
 note the Turn Left key isnt the same as the Move Left key. If you
 can't make it working, try config the Turn Left key to "Q" and Turn
 Right key to "E". Then type Q,Q,E,E,Up,Down,Left,Right should be okay)
 
 
 At the main menu, type:
 Z, C, Z, C, UP, DOWN, UP, DOWN, LEFT, RIGHT
 for fast game.
 
 During gameplay, type:
 press UP, A, RIGHT, A, DOWN, A, LEFT, A, UP, S, D
 to play without the dragon.