Change Firing Setup
Press A + B + C to change your firing setup.

Invincibility
Press Start on Controller Two as soon as the game begins and hold it until you get to the Weapons Select screen. Your energy will decrease, but you won't die.

Major Weapons
Fly to the warship without shooting any enemies on Level 1, then destroy the warship at 52 miles or more from the base. You will have 2,800 points and no bonus weapons ... until you start the next level.

More Continues
Begin the game and destroy your warship. Let Rex die on his way to the shuttle. Choose the Option mode, set Pad Reset to "Enable", and press C + Start.

Two-Player Game
As soon as the first green robot walks from the right side of the screen, press Start on Controller Two. Player 2 should now have control of the next robot to come along.