To get the Sewer Key, you need to solve a lever puzzle and then pick up the Sewer Key from a hidden location. You must pull the Blue Lever, the Red Lever, and the Green Lever in sequence. After that, unpull the Red Lever and the Blue Lever. Then, pull the Purple Lever and the Red Lever (again). After that, grab the Sewer Key and unlock the Sewer Gate. Harvest the Cosmic Cash Vine to get the Cosmic Farmer Badge.
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