Gradius Galaxies All power-ups
Pause the game and press Up(2), Down(2), L, R, L, R, B, A, Start. Note: This can only be done a limited number of times until it causes your ship to self-destruct.
Self-destruct
Pause the game and press Up(2), Down(2), Left, Right, Left, Right, B, A, Start.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original