Because i have been and that i will tell you the coordinators for the island 30o 45'n, 45o 30'w
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After you pass the gates you will have to battle Zeus and after that you will win the island medallion from his daughter.
AresHermesAphroditeArtemisHestiaApollo
See Aphrodite and pass her test.
You just jump over the scorpion and ran!
you have to pass aphrodite's god quiz
You have to spell out the word TEN with the bones.
five of each
Spell the word "ten" with the bones.
when you go to the 4 island using rainbow pass go to right side of the island there a lady near the gate the gate is of Icefall cave
Enter the realm of Poseidon through the temple (far right of the island). Use the starfish from the Museum of Olympus to enter the door. On the beach, Aphrodite will give you a test and reward you with a valuable mirror if you pass. (The answers are Ares, Hermes, Aphrodite, Artemis and Hestia.) The Hydra cave is underwater off the beach. Dive down and swim along the top, right, and bottom of the maze to reach the cave (above the cave is the Giant Pearl). You can defeat the hydra by jumping up when it strikes at you, and landing on the attacking head. Finish all five the same way before any can wake up. Swim below the Hydra and you can get the scale from it.
pass the "groove of temples", and pass Hades's Kingdom. The take a ride on the the rock that shoots up. then you get to poseidan