How people know for the first time the secret missions to unlock LDs like Odion,Crow Hogan in the first place(not by googling)and Easter eggs like Konami bonous(Win a duel with 5730 Life Points remaining)?
Answer
Answer List
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Slifer
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Inflict 50000 (or 5000) damage in one duel in Yu-Gi-Oh arch-v to unlock sylvio sawatari
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Datamining
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Use solemon wishes
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10000 points of effect damage to get fire princess
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They don't. You can only find this out by coincidence.