Was the purple egg trigger ever found to actually change any characteristics in the game? For instance... being able to walk through the final lightning door with less than 250 stars maybe? {dizzy}:lookup:
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Using an emulator with a memory editor, like Exodus, find the Address A2A8, and enter the value 003C. Boom, you have Prince's Secret Sign. It may not show up correctly in your live inventory, so open the one that is basically a pause screen to see it.