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Completed the Eden episode.

Picking right up from the Hold On To Your Belief episode, zipline back to Evelyn and the professor. After some dialogue, place the puzzle pieces in the center. Rotate the rings so the outer symbols match the symbols on the pillars. A second puzzle will then rise up out of the center. Rearrange the tiles so they align with the symbols on the inner circle. This opens the door and unlocks the achievement.

Afterwards, take the mine cart back to the plane to finish the episode.