Level jumps:
     Complete the following tasks to jump to a new stage:

Jump to level three after defeating Core Fighter
     In  level  1,  when  the  thousands  digit of your score is even,
destroy 4 hatches

Jump to level four:
     Destroy  Xaerous  Core  at end of level 2 within 2 seconds of its
core turning blue

Jump to level five after completing level:
     Destroy 10 stone heads in level 3

Full Option Command 
     While  playing  the  game,  push  Start, then press UP, UP, DOWN,
DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A, START.

Continue 
     Push  Down,  Up, B, A, B, A, B, A, Start at the Game Over Screen.
Note: You can use only once per game.

Get 10K Bonus Points
     Get  6  powerups  so  that  the ? box is selected. Then, when the
thousands  digit  of your score is a 5, get a 7th powerup and you will
get 10K bonus points.

KONAMI ONE, GRADIUS ONE messages:
     While  turning  the  power ON or resetting the system Hold B + A.