Beating Zeus wins the game. You will automatically return to normal and give the 5 items to Athena for safe-keeping. She gives you the Island Medallion and you leave the island. Zeus is not seen again on the island.
(see related question)
On Mythology Island in Poptropica, the final thing you do is defeat Zeus in a battle to stop him from taking over the island. Once you defeat Zeus, you will have completed the main quest of the island and can claim your medallion.
you go on your quest and then after you battle zeus you will get the medal
After you pass the gates you will have to battle Zeus and after that you will win the island medallion from his daughter.
Zeus is the god on Mythology Island.
You have to have Posideon's staff and Hades' crown, so that you can battle Zeus when he gets angry.
he is where you pick apples
In the final battle on Olympus, you put on Hade's crown and Poseidon's trident to grow larger and battle Zeus.
This may be a reference to Zeus, who you battle twice on Poptropica (Mythology Island and Super Villains Island). See the related questions below.
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Find him and click on him.
Click the torches to light the arena and summon Zeus. You will have to battle him to stop him from using the 5 sacred objects to rule Poptropica. (see related question)
You cannot do this on the island because Zeus never appears as a character, only in the animated sequences.