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The first antique coin is found on some barrels to the right of the first access door you enter, to the right of the Storage Box and save station in the main 'lobby' area.

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The second antique coin appears once you enter the first door after the Storage Box and save station from the 'lobby'. It's to the side of an oil drum, before you meet the second soldier you need to save behind a locked gate.

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After you see the second soldier behind the locked gate and promise to rescue him, then go up the elevator, at the fork stay to the right. Find antique coin 3 on a sandbag next to some barrels in a corner.

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Enter through the second garage gate after securing the high-grade filter. On the way to the Storage Room, Antique Coin 4 is on top some garbage bags at a turn.

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After you take care of the swarm of mini monsters and go up the elevator, Antique Coin 5 is on top of some barrels at the turn of the path.

You'll see the famous 'three turrets placed at the end of a path to kill you' beyond the inoperable gate.

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As you progress and unlock a gate from one side, there will be a fork. To the right is an enemy behind whom are the famous three turrets you need to take out to progress without getting shot, usually with a tossed grenade.

Instead, go to the left and follow the path down.

Pass by a red explosive barrel laying on a shelf on the right and at the turn there's a powerful enemy at the end of the hallway. Go to the left path before him and find two breakable boxes right in the middle between some shelves. They're safe; cut them or shoot them open, take their contents, and the Antique Coin 6 will be on a tall barrel at the end of the hallway, right next to a free Lockpick.

You can then pass the powerful enemy at the earlier turn and continue down that path to unlock the door to resume on to the main path.

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After securing the night vision and escaping the maze, from the 'lobby', go through the next gate on your way to the Mine Cart Yard. Antique Coin 7 is on top of this paint can in the first right turn you make.

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Antique Coin 8 is between a stack of blue rectangular crates before you make the turn around the clown who has the Clown Key. You can find this stack and get the coin before taking the Clown Key and starting the ambush.

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After not really rescuing your third soldier and going to the little hallway after the laser trap room, Lucas will communicate to you and a timer will start. Before climbing up the ladder, check the corner opposite.

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The last Antique Coin can be found while the timer is going down. Use the Clown Key to go through a locked door in a room you previously visited, go through the next unmarked door, and there will technically be a fork. Instead of left, go right past the tank and crouch under the slightly ajar door. Follow the path all the way down to the end, and there's the last coin with some helpful items nearby.

You need to collect this before you start the miniboss, or the path will be closed off.

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