When you complete ALL the Akumpa Ruins levels Antartica Temple will become unlocked, to unlock this feature for ALL the characters you must view the True Ending.
The Key of Serpentis can be found near the exit door in level 2-1. You will only be able to access it after unlocking Antartica and when using Aban Hawkins.
Complete World 1 and watch the video sequence. Aban will talk about the temple of Poko-mum and refer to it as "Pocket Monster", which is the Japanese title for the Pokemon series of games.
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