Here are some cheats and tips for the game Gradius Galaxies.
All power-ups:
Press Start to pause game play, then press Up(2), Down(2), L, R, L, R,
B, A, Start.
Half speed:
Press Start to pause game play, then press Left, Right, Up, Down,
Left(2), Right, Start. Repeat the code to disable its effect.
Self-destruct:
Press Start to pause game play, then press Up(2), Down(2), Left, Right,
Left, Right, B, A, Start.
Delete saved game:
Enter the options screen, highlight “Exit”, then hold L + R + B and
press Start.