Outgoing have you been looking for different landmarks on the map. One of them is a large windmill. But when you reach it, you will notice that it is not working. This is because you have to complete a puzzle involving some switches to get it working again.
Doing so will unlock the Round 'N Round Achievement or Trophy. Also, it allows you to reach the terminal in the windmill, which means you can acquire a new blueprint. Here is a full explanation of how to complete the gear puzzle.
To solve the gear puzzle, you must have 20 scrap metal. So make sure you walk around and collect some scraps before you even travel to the windmill. You will most often find some around signal towers.
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How to reach the top of the windmill
When you enter the windmill you will see a door on the ground floor with a red light above it. Ignore it for now and go upstairs.
At the top of the stairs you can find two levers. Use these to spin the wooden platform above you.
That platform is divided into three. One contains a collection of boxes, another has some shelves and the third has a ladder.
Spin around enough so that the collection of boxes is directly above the two levers.
Then climb the ladder to get up there.
Next, climb the crates and look up to see a green switch. Turn it over take down another ladder. It may fall behind the shelves, so go back down to pull the lever to move them out of the way.
How to fix the windmill
Climb up the new ladder to reach the wind. Up here you can find some big gears and a traction brake lever.
Go up to large broken gear and use your scrap to fix it.
When it is fixed, pull the lever. This activates the windmill, meaning you have completed the gear puzzle.
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