Cheat code

There is a cheat where the aliens will no longer fire.

When the aliens are first flying in and forming rows above you, keep the two aliens alive at the very bottom, left side of the screen; shoot all other aliens except for those two. Let them keep on flying over and over (don't let them hit you) until they stop firing, which takes several minutes. None of the aliens will fire ever again for the rest of the game.

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