Gradius 2: The World of Gofer

Full weapon power-up:
Pause game play and press Up, Up, Down, Down, Left, Right, Left, Right, II, I then resume. Note: This code may only be enabled three times under the easy difficulty level and once under all other difficulty levels.

AC mode:
Press Run to load the game, then hold Up + I + II until the title screen appears. "AC.MODE" will appear at the top of the option menu to confirm correct code entry. Note: The game can not be continued when this code is enabled.