From the game A Boy and His Blob for the NES.

At the beginning of Blobolonia, the blob's planet, run all the way to the left until you can't go any farther. Toss a jellybean at the left side of the screen. If you did it right, the screen will flash the final boss screen for a brief moment. Now there will be no enemies at all on Blobolonia.

Taken with permission from Flying Omelette.

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