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The Encoded Egg was a Medium Easter egg in the 2020 Easter Event. It could have been obtained by entering the code "84G02Sm&RqP" (Found on Isaac's Twitter) in the Codes interface.
Trivia[]

- After entering the code and collecting the egg, the code menu will become corrupted, and it will say "Error". Closing the code menu and reopening it will return it to normal.