Near-Invulnerability and Stage Select
At the title screen hold Down and press both the A and B Buttons together some number of times (1-5). You should hear a chime. You will not be invincible when you play the game, but you will have 30 times the normal health, which is more than enough. The number of times A+B are pressed should correspond to the stage number you wish to go to; six times will show the ending, with an additional message. You cannot progress from stage to stage normally - instead just looping through the same stage - and if you start from the ending you'll begin gameplay with 1 health point and no weapon, not the usual 8 points and a laser.
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